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Production technology of polyacrylamide probably also experienced three stages

Production technology of polyacrylamide probably also experienced three stages

The first stage is the earliest use of disc polymerization, solution polymerization is about to put a good mix of stainless steel plate, stainless steel plate and then push them to the insulation drying room, a few hours after polymerization, launched from the drying room, and put together with guillotine Acrylamide cut into strips, into the meat grinder granulation, drying room drying, crushing finished. This process is entirely manual workshop.

The first stage is the earliest use of disc polymerization, solution polymerization is about to put a good mix of stainless steel plate, stainless steel plate and then push them to the insulation drying room, a few hours after polymerization, launched from the drying room, and put together with guillotine Acrylamide cut into strips, into the meat grinder granulation, drying room drying, crushing finished. This process is entirely manual workshop.

The second stage is the use of a kneader, coming in the mixed polymerization liquid was heated kneader, after the start of the polymerization, start a kneader, kneading while carrying out the polymerization, the polymerization after the granulation is completed, the pouring material is dried , crushing finished.

The third stage is the late 1980s, developed a conical reactor polymerization process, the nuclear industry is located in Jiangsu Jiangdu five chemical test success. The process in the lower conical vessel with a rotary knife made materials, polymer extrusion, while Serve granular, tumble drier, crushing the products.

Polyacrylamide gel in order to avoid adhesion in a polymerization block of autoclave wall, some techniques using the polymer compound of the fluorine or silicone coating on the inner wall of the polymerization vessel, but the coating layer in the production process is easy to fall off and contaminate poly Acrylamide products.

Polyacrylamide current production technology abroad and said third stage is substantially similar, but somewhat different on the device: the size and type of the polymerization vessel (autoclave fixed cone, the cone is also rotatable reactor, the polymerization reaction was completed after , reverse the polymerization reactor block polyacrylamide gel poured), granulation method (mechanical granulation, cutting granulation, wet granulation that have dispersion granulation), drying method (with the use of cross-flow rotary dryer, there are vibrating fluidized bed drying) and smash way. Some of these differences are the differences in the quality of equipment, some of which are used in oil differences on specific ways, but, in general, tend to be fixed cone polymerization reactor polymerization, vibrating fluid bed drying technology.

In addition to the production technology of polyacrylamide unit operations, in the process, there are obvious differences in the formulation, such as the current production of ultra-high molecular weight polyacrylamide production process, is also caused by low temperatures, there is a total alkali hydrolysis ago processes and after alkali hydrolysis process of the points, two methods have advantages and disadvantages of the former alkali hydrolysis process is simple, but there are easily hydrolyzed to produce a large heat crosslinking and relative molecular mass loss problem, after alkali hydrolysis Although the process has increased, but not easily hydrolyzed to produce a uniform cross-linking of the product relative molecular mass loss is not great.
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