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Innovative Craftsmanship Creates a Promising Future | Automated Production Line of High-Flow Disc Bead Mill and Spray Granulation Dryer Enables Mass Industrial Production of DF Dry FlowablesDriven by accelerated global agricultural modernization and increasingly stringent environmental regulations, pesticide formulations are undergoing a profound shift from traditional highly polluting, low-efficiency varieties to eco-friendly, efficient and precision-oriented products. As a premium type of water-dispersible granule, Dry Flowable (DF) features zero dust, solvent-free composition, high suspension rate and long-lasting efficacy. It has become an ideal alternative to conventional wettable powders and emulsifiable concentrates, accompanied by explosive growth in market demand. From the market perspective, food security pressure brought by population growth fuels continuous expansion of the pesticide industry. Capable of cutting pesticide dosage and improving efficacy utilization, DF conforms to the national strategy of pesticide reduction in agriculture and is widely favored by growers. In terms of environmental policies, traditional pesticide formulations face strict restrictions due to dust pollution and volatile organic solvent emissions. In contrast, the eco-friendly properties of DF comply with regulatory standards, leading to steady expansion of its market share. Meanwhile, modern agriculture puts forward higher requirements for convenient and precise pesticide application. DF is easy to measure and compatible with various spraying methods, further expanding its application range. Widely applicable to field crops and cash crops alike, DF has evolved into one of the mainstream pesticide formulations. In the future, with continuous upgrading of core technologies including spray drying and ultrafine grinding, DF will develop toward higher purity, better stability and lower production costs. Industrial competition will center on technological innovation and mass production capacity.          Production Process Analysis of DF Dry Flowables The manufacturing process of DF consists of four core procedures: raw material pretreatment, wet bead milling, spray granulation & drying, and post-treatment. Precise technical control of each procedure directly determines final product quality. Raw Material Pretreatment Strictly control the particle size and mixing ratio of pesticide technical materials and auxiliary agents. Pre-crush raw materials to meet particle size requirements, then conduct precise batching to optimize the physicochemical properties of the system, laying a solid foundation for subsequent suspension preparation. Wet Bead Milling This is the critical procedure to prepare fine-particle suspension. High-efficiency grinding equipment refines material particles to guarantee superior dispersibility and suspension performance of finished products. Spray Granulation & Drying The suspension after milling is atomized into tiny droplets via atomizers, which exchange heat and mass with hot air to form hollow spherical solid particles. This procedure requires precise control over atomization parameters, drying temperature and airflow distribution to ensure uniform and stable particles. Post-Treatment Remove unqualified particles through mechanical screening and air classification. A full-process quality control system is implemented to guarantee the finished products meet specified particle size distribution standards.        Breakthroughs Brought by Our Innovative Craftsmanship Longxin Drying independently developed a complete automated production line integrating grinding and spray drying equipment for DF. It deeply combines high-flow disc bead mills and dedicated spray granulation dryers to realize full-process automatic control from raw material feeding to finished product output. Centered on three design concepts: high efficiency, high precision and environmental protection, the line leverages process optimization and intelligent control technology to tackle persistent drawbacks of traditional production, such as low efficiency, inconsistent product quality and high pollution risks. Equipped with an advanced real-time monitoring platform, it supports full-process digital collection and adjustment of key parameters including grinding temperature, material flow, atomization pressure, drying temperature & humidity and particle size, ensuring stable and traceable production. The one-touch cleaning system paired with a dead-space-free design eliminates cross-contamination at the source, greatly boosting flexibility for multi-product manufacturing and delivering reliable support for large-scale industrial production.      High-Flow Disc Micron Bead Mill: High-Efficiency Milling for Superior Slurry Quality As the core grinding equipment of the whole line, the WSP-E high-flow disc micron bead mill developed by Longxin Intelligent serves as the key facility for DF wet milling with multiple proprietary technical innovations. It adopts a composite grinding structure of disc plates and pin rods. Disc plates break up materials and generate strong high-speed shear force, while pin rods reinforce grinding effects. Compared with traditional single-disc structures, it achieves higher grinding efficiency, eliminates most grinding dead zones and reduces material residue. Multiple customized material options are available: ceramic, polyurethane (PU) and hardened German steel. Ceramic and PU components deliver zero metallic contamination, meeting DF’s strict purity standards and preventing impurities from damaging pesticide active ingredients. Designed for high throughput with an increased filling rate of the grinding chamber far exceeding conventional models. Its maximum hourly processing capacity reaches 1,000 liters, greatly outperforming traditional equipment to fully satisfy mass production demands. The jacketed cooling system realizes heat exchange with process liquid to accurately stabilize grinding temperature and effectively prevent thermal decomposition of pesticide active ingredients. Complete safety protection configuration: an automatic pressure protection device and comprehensive electrical protection system. The machine will automatically stop and release pressure once the pressure inside the grinding chamber exceeds the preset threshold (0.2–0.4 MPa as standard). The electrical system monitors operating status in real time to guarantee safe and stable production. The front discharge valve shortens cleaning and product switching time, improves changeover efficiency and significantly cuts time costs for multi-variety production.       Spray Granulation Dryer: Precision Drying for One-Step Pellet Forming Custom-built for DF manufacturing, this spray granulation dryer undergoes comprehensive technical optimization targeting industry pain points, with outstanding performance in energy conservation, efficiency and product quality control. The straight cylindrical tower body ensures uniform distribution of wind speed and heat to avoid material adhesion on tower walls. The improved conical hot air distributor works together with baffle rectifying plates to convert hot air into stable straight airflow, reducing heat loss caused by turbulent flow and raising thermal efficiency. Rotary pressure nozzles are adopted to solve the defects of traditional nozzles such as narrow atomization angle, short service life and high energy consumption. Droplet size can be precisely adjusted according to product requirements to ensure uniform particles. An enlarged section or cyclone structure at the tower bottom improves material output and pellet forming rate. Matched with innovative fine powder recovery technology and dust suppression devices, it reduces material loss and optimizes the operating environment. In terms of process control, energy utilization efficiency is maximized by optimizing the temperature difference between air inlet and outlet as well as pre-dehydration treatment. On the premise of guaranteeing product quality, the air inlet temperature can be moderately raised while exhaust temperature is lowered to reduce heat waste. Raw materials are pre-dehydrated and preheated before entering the drying tower to cut evaporation load and further improve energy-saving performance. During drying, pellet particle size can be precisely regulated by adjusting atomization pressure and hot air velocity. Combined with anti-agglomerant addition, particle adhesion is effectively inhibited, enabling finished products to feature excellent disintegration and suspension performance. Pellets produced by this dryer boast high sphericity and good flowability. They disintegrate within seconds after contacting water and maintain a high suspension rate, fully meeting core application requirements for pesticides.    Lead Industrial Transformation, Embrace a Greener Future Featuring technological innovation as its core competitiveness, the automated DF production line combining high-flow disc bead mills and spray granulation dryers from Longxin Drying closely follows the global trend of green and reduced-dose pesticide formulations, injecting powerful momentum into agricultural green transformation. The deep integration of high-efficiency grinding and precision drying technology achieves dual improvements in DF production efficiency and product quality. Its strengths including zero metallic contamination, low energy consumption and full automation not only help manufacturers cut production costs and strengthen market competitiveness, but also drive the pesticide industry toward high-quality and sustainable development. In the future, Longxin Drying will continue to focus on grinding and drying technology research and development. Relying on the innovation capability of its technical team, we will continuously optimize production line performance and develop more intelligent equipment tailored to diverse industrial demands. Through in-depth integration of premium equipment and self-developed proprietary processes, Longxin Drying will provide superior and more efficient solutions for the agrochemical industry, supporting more manufacturers to complete production upgrading and industrial transformation. Empowering the development of green agriculture with our innovative craftsmanship, we will write a new chapter of innovative development for the whole industry.Read More

Sealed boiling dryer for p-nitrobenzoic acidCase introduction: Para-nitrobenzoic acid closed boiling dryer is a new type of dryer with inert gas to protect recyclable solvent. When the wet material of para-nitrobenzoic acid enters the main engine of the dryer through negative pressure or floor blanking, the inert gas is injected into the drying system. After the system contains a certain amount of oxygen, the hot air and wet material of p-nitrobenzoic acid are fully mixed to carry out mass and heat transfer.P-nitrobenzoic acid is a yellow-white crystal, commonly used as pharmaceutical intermediates, such as procaine, procaine amide, folic acid and other drugs synthesis, but also widely used in dyes, fuels and synthetic pesticides. Potassium p-nitrobenzoate is toxic and irritating to the skin, and should be sealed and dry and kept away from light. Production equipment should be sealed to prevent leakage. Operators should wear protective equipment to avoid contact with skin and eyes of potassium p-nitrobenzoate. Production process of p-nitrobenzoic acid:It is obtained by the oxidation of p-nitrotoluene. The oxidizing agent can be sodium dichromate, air, manganese ore powder, nitric acid, etc. P-nitrobenzoic acid was synthesized from p-nitrotoluene by oxidation with sodium dichromate in the presence of sulfuric acid at 55℃. The reaction liquid is filtered, dehydrated and dried to obtain the finished product. In addition, 1-p-nitrophenyl-2-amino-1, 3-propanediol, the right-hand compound in the production of chloramphenicol, is easily oxidized with nitric acid to obtain p-nitrobenzoic acid.According to the physical characteristics of p-nitrobenzoic acid, Longxin selected closed boiling as the prototype machine, and made a special dryer for p-nitrobenzoic acid through continuous research and development and improvement. Closed boiling dryer is a new type of dryer with inert gas to protect recyclable solvent. When wet material of p-nitrobenzoic acid enters the main engine of the dryer through negative pressure or floor blanking, inert gas is passed into the drying system. When the oxygen content of the system reaches a certain content, the hot air after heat exchange of the heat exchanger will be sucked into the dryer through the fan under negative pressure .Mass and heat transfer were carried out after mixing with p-nitrobenzoic acid wet material. The p-nitrobenzoic acid is continuously dried, and the steamed moisture is continuously sucked out by the induced draft fan.The extracted gas and part of the fine powder will enter the gas-solid separator, and the separated p-nitrobenzoic acid fine powder will settle and recover, and the gas will be taken away by the fan. The moisture will be dehumidified by the surface cooler, and then into the cooling recycler, until a certain amount is reached, and then out of the system, collected and stored. The gas dehumidified by the surface cooler will return to the heater inlet for the next drying cycle.Para-nitrobenzoic acid closed boiling dryer equipment features:1. the operation of the equipment is completely closed, the internal is filled with inert gas protection, effectively isolated the external air intrusion, the whole equipment explosion-proof, deodorant, anti-solvent gas leakage.2. the solvent gas is closed recovery, not only to protect the environment, no pollution waste gas discharge, in line with national GMP standards, recovery of solvent means high economic benefits and cost reduction.3. The air dehumidified by the condenser is a dry gas with low moisture content. When the inert gas is nitrogen, the effect of nitrogen displacing the solvent greatly improves the drying efficiency.4. The micro-negative pressure operation of the drying host can avoid the occurrence of powder jet in the host when the equipment is micro-leaking.5. set up a burst port and oxygen sensor, effectively avoid the equipment beyond the operating conditions after the occurrence of safety accidents.Structure characteristics of sealed boiling dryer for p-nitrobenzoic acid1. the host adopts circular vertical structure, there is no dead Angle in the host. Automatic feed and feed structure is adopted, and there is a stirring mechanism in the skip, which can break the phenomenon of ditch flow and assist fluidization. The inner bag dust collector is arranged in the upper cylinder body, and the ash is cleaned by pulse chamber. The skip car and the main engine are sealed by silicone, with good sealing performance and no leakage. The main machine is equipped with a blasting port, which automatically explodes when there is a security hazard in the system.2. the gas-solid separator adopts high pressure pulse online dust removal method, the cloth bag adopts the suction type skeleton structure, easy to disassemble, the cloth bag adopts peritoneal cloth bag dust removal effect is good, there is no dust in the tail gas, can ensure the dust collection rate of more than 99.5%, and effectively protect the table cooler and heater.3. the surface cooler (liquid collection tank needs to be equipped with another) adopts efficient plate fin structure, which can effectively recover the solvent in the tail gas, and the solvent recovery rate is more than 90%.4. the fan adopts the company's special sealing form, which can ensure that the external leakage rate of the system is zero.5. the heater uses bent fin winding fin tube, high thermal efficiency, small volume.Longxin continues to absorb advanced technology at home and abroad and with more than ten years of down-to-earth drying experience, the airtight boiling dryer improved and developed has been popular sales since its debut, has been widely used in all walks of life, and has become a star product of our company .Our company has the industry's advanced experimental center, equipped with a variety of prototypes, warmly look forward to new and old users to visit the factory for testing, to discuss cooperation!Read More

Cellulose dryerCase introduction: The cellulose dryer is made of hot air tangentially enter the bottom of the dryer, and form a powerful rotating wind field driven by the agitator. Under the strong action of the high-speed rotating stirring paddle, the material is dispersed under the action of impact, friction and shear force, and the massive material is rapidly crushed, fully in contact with the hot air, heated and dried.Cellulose is a macromolecular polysaccharide composed of glucose. Insoluble in water and common organic solvents. It is the main component of plant cell wall. Cellulose is a kind of polysaccharide widely distributed and abundant in nature, accounting for more than 50% of the carbon content in the plant kingdom. The cellulose content of cotton is close to 100%, and it is a natural source of pure cellulose. In general wood, cellulose accounts for 40 to 50%, and 10 to 30% hemicellulose and 20 to 30% lignin.Cellulose is an ancient and abundant natural polymer on the earth, which is inexhaustible and a valuable natural renewable resource for human beings. Cellulose chemistry and industry began more than 160 years ago, and is the main research object during the birth and development of polymer chemistry. The research results of cellulose and its derivatives have made significant contributions to the establishment, development and enrichment of polymer physics and chemistry.Working principle of cellulose dryer:Flash dryer is by the hot air tangentially into the bottom of the dryer, driven by the stirrer to form a strong rotating wind field. The material enters the dryer by the screw feeder, under the strong action of the high-speed rotating stirring paddle, the material is dispersed by impact, friction and shear force, and the block material is quickly crushed, fully in contact with the hot air, heated and dried. The dried material is carried by air into the dust collection system for collection and treatment, and the tail gas with dust content ≤50mg/m3 is discharged by the induced draft fan to complete the whole drying process.Cellulose dryer equipment features:1. High gas velocity in the drying room, short residence time of materials, effectively prevent the material from sticking to the wall and the deterioration of heat-sensitive materials, and can be dried into uniform powder products at one time, eliminating the grinding, screening and other processes.2. The drying chamber is equipped with grading ring and swirl sheet, and the fineness and final moisture of the material can be adjusted. The special air distribution device reduces the resistance of the equipment and effectively improves the drying uniformity of the material.3. The bottom of the dryer is equipped with a special cooling device and air pressure seal to avoid deterioration of the material in the bottom high temperature area.4. It can effectively control the final moisture and fineness, and ensure the moisture content and fineness of the product are uniform through the adjustment of the feeding, hot air temperature and classifier.Flash dryer is a new type of continuous drying equipment which integrates drying, crushing and screening. It is especially suitable for drying filter cake, paste and mud paste. The drying time of the wet material in the drying tower is only tens of seconds, the water evaporates instantly, and the quality of the dried product has a great relationship with the drying temperature, wind speed, air volume, and the crushing speed.Longxin has an innovative design scheme to control the size of finished particles and the final water content by adjusting the wind speed, air volume and crushing speed entering the tangent line of flash drying.Read More

Chemical engineering industry