Patent Conical Filter and dryer for glufosinate ammonium Introduction
Glufosinate-ammonium is currently one of the largest pesticide varieties in the world. Compared with glyphosate, glufosinate has a better removal effect on some perennial malignant weeds and is more competitive in the field of high economic value crops. As an excellent herbicide, glufosinate is very suitable as a resistance gene. These genetically modified crops are not only widely grown in North America, but have also been promoted in some countries and regions such as Asia, Australia, and Europe in recent years. With the rapid development of transgenic technology, the market prospect of glufosinate-ammonium is very promising.
Existing purification process of new herbicide glufosinate-ammonium
(1) Preparation of concentrated solution
After the 1-(methylethoxyphosphonyl)-butyronitrile solution is acid hydrolyzed by refluxing hydrochloric acid, the reaction solution of glufosinate-ammonium hydrochloride is obtained, and then the reaction solution of glufosinate-ammonium hydrochloride is distilled under reduced pressure to remove the dilute hydrochloric acid to obtain Concentrate A; Add ammonia to the concentrate A, adjust the pH to 5-10, after the dispersion is uniform, increase the temperature and keep stirring, then distill the water under reduced pressure to obtain the concentrate B;
(2) Crystallization and solid-liquid separation of crude glufosinate-ammonium
Add the flotation solvent alcohol to the concentrated solution B. After the temperature is raised and the dispersion is uniform, the temperature is lowered, and then continue to stir until the materials are evenly dispersed; at the flotation temperature of 15-50 ℃, the uniformly stirred materials are slowly put into the chute, and the materials pass After the chute, due to the difference in the proportions of the main component and the secondary salt, 10%-30% of the main component particles are brought to the collection tank along with the flow of the flotation solvent alcohol, while 70% to 90% of the secondary salt particles settle due to the heavy weight. On the chute; the secondary salt on the chute is collected and separated from the solid and liquid;
(3) Purification of glufosinate-ammonium Filtering, washing and drying
The filter cake is washed twice with the flotation solvent alcohol, and the filtrate is mixed with the alcohol solution containing the main components in the collection tank; the alcohol solution containing the main components in the collection tank is transferred to the recovery tank for reduced pressure distillation to remove the solution, and then water-containing methanol is added After the temperature is raised and the dispersion is uniform, the pH is adjusted to be greater than or equal to 8 through ammonia gas, the temperature is lowered, and the solid-liquid separation is performed. The filter cake is washed twice with water-containing methanol and dried to obtain the final product glufosinate-ammonium.
Technical problems of existing synthesis and purification process of glufosinate-ammonium
The production process of glufosinate-ammonium is complicated. It takes 13 reaction processes and more than half a month to produce the product. It has the characteristics of large investment, complex production process, high technical requirements, high safety pressure, and strict environmental protection requirements.
(1) It is difficult to control the safety of raw materials and process reactions
The existing synthesis process of glufosinate-ammonium involves more than ten kinds of chemical raw materials, most of which are flammable, explosive and have low flash point chemical characteristics. In particular, sodium cyanide is a highly toxic substance, and a little carelessness will cause safety accidents. . At the same time, multiple steps of the process need to be carried out in a strictly anhydrous and oxygen-free airtight environment.
(2) Large emissions of three wastes
The synthesis route is long, and there are more than a dozen operation units such as distillation, rectification, and filtration. Each unit will produce corresponding three waste materials, which is difficult to handle and increases environmental protection pressure. For every ton of glufosinate-ammonium raw drug produced, the amount of process waste water is about 60 tons. Most of the waste water needs to be evaporated to dryness to obtain waste residue, and some waste residue and crystallization leftovers are difficult to reuse.
(3) Low product yield
Compared with Bayer in Germany, the domestic production cost of glufosinate is higher, and there is no price advantage in the international market.
(4) Failed to realize continuous and automated production, high investment in production line equipment
Compared with foreign countries, the quality of glufosinate-ammonium produced by domestic enterprises has a certain gap. The requirements for production equipment are relatively high, and a large amount of money needs to be invested in the maintenance of equipment.
Key equipment for automatic production of new herbicide glufosinate Patent Conical Filter and dryer
The function of filtration and washing equipment is to realize solid-liquid separation of the crude glufosinate-ammonium slurry obtained by the reaction, and then use the washing liquid to wash the glufosinate-ammonium filter cake obtained to remove the residual ammonium chloride and inorganic salts in the filter cake , Other by-products. At present, most glufosinate-ammonium manufacturers use integrated filtration and washing equipment, mainly including filter presses, centrifuges, microporous filters, and new-type cartridge-cone filtration and washing two-in-one equipment.
(1) Filter press
The filter press is a commonly used filtering and washing equipment. Traditional filter presses generally require manual operation of the entire filter press process, including feeding, pressing, air blowing, and unloading. In particular, the unloading is labor-intensive, the filter cake is difficult to remove, the entire filter press cycle is long, the processing volume is small, and dehydration The washing effect is poor, and the material is usually cast iron, which is heavy and easy to wear.
In recent years, the technical level of filter presses has been greatly improved. Fully automatic filter presses have been well applied. The entire filter press process is automatically controlled. Stainless steel or synthetic materials are selected for the material, and the filter chamber is enlarged and enlarged in structure. The diaphragm design increases the filtration pressure, the processing capacity is large, the filter press cycle is short, the dehydration efficiency is high, and the washing effect is good, which can meet the production requirements of glufosinate-ammonium purification.
Centrifuge is a machine that uses centrifugal force to separate different components of liquid and solid particles or liquid mixtures. The core component of the centrifuge is the rotating drum, which rotates around its axis at a high speed, usually driven by a motor. After the solid-liquid mixture enters the rotating drum, it is quickly driven to rotate at the same speed as the rotating drum. The solid and liquid are separated under the action of centrifugal force. The solid particles are intercepted on the inner wall of the rotating drum and the liquid is discharged from the centrifuge.
Commonly used centrifuge types include three-foot centrifuge, flat-plate centrifuge, horizontal screw centrifuge, disc separator, tubular separator, etc. Among them, three-foot centrifuge and flat-plate centrifuge are suitable for the synthesis of glufosinate And purification production.
(3) Microporous filter
The microporous filter is a new type of solid-liquid separation equipment with the characteristics of high operating efficiency and high filtration accuracy. The structure of the microporous filter is to hang special polymer PE and PA microporous tubes in a vertical closed body, and the filtrate is discharged through the microporous tube.
(4) Patent Conical Filter and dryer
The "two-in-one" equipment for filtration and washing is a simplified product based on the "three-in-one" equipment for filtration, washing and drying. The two processes of filtration and washing are completed in a closed container. It is mainly used in the pharmaceutical industry to solve the continuous production of flammable, explosive and toxic products. It is especially suitable for materials with high requirements for washing effects and can reduce the labor of the operation process. Strength, reduce the loss of finished products.
Patent Conical Filter and dryer for glufosinate ammonium technical advantages
(1) Our Patent Conical Filter and dryer can complete the reaction, extraction, filtration, repeated filtration, washing, drying and other operations on a single machine to directly obtain the finished product.
(2) The operation flexibility is large, and the operation cycle can be adjusted by adjusting the filter pressure difference, the rotation speed, and the screw extrusion guide rail to adapt to the changes in the process conditions.
(3) This function can form a thin filter cake on the surface of the filter medium, without filter cake filtration, high filtration speed per unit filter area, and compact equipment structure.
(4) A fully enclosed system with a good operating environment is especially suitable for processing toxic, flammable, explosive and hazardous products that are not allowed to be polluted and fresh food biological products.
(5) It can both wash and filter. Especially when the materials need to be rinsed, they should be thoroughly cleaned in a suspended state and finally filtered to reduce the material transfer process and reduce pollution and waste, so the processed products are of high quality.
(6) It can be used for three operations: reaction, filtration, and drying. It completes the functions of three units and greatly reduces equipment costs, floor space, labor intensity, and energy consumption.
(7) The power consumption of this machine is low, the squeezed cake has lower moisture than the ordinary flat plate type three groups, and the operation is convenient.
Purification of the new herbicide glufosinate-ammonium is an indispensable part of the production process for the preparation of glufosinate-ammonium, and the selection of its key equipment is critical to the performance of the material. The new Patent Conical Filter and dryer developed and produced by Wuxi Shuangrui Machinery is used as a new method of solid-liquid separation, purification and purification of glufosinate-ammonium, which can effectively reduce the three wastes in the purification process of glufosinate-ammonium, prolong the service life of the equipment and simplify the purification operation. , Improve product purity, reduce purification cost, and have good application prospects.