Method and apparatus for drying copolymer of methyl methacrylate-styrene-butadiene

Abstract

The combined continuous airflow-cyclone MBS drying process includes drying wet MBS with hot air in a pulse drier to reduce water content to 10-15 %, making MBS enter to the cyclonic drier tangently in eddy flow mode to delay dry with hot water as heat source to water content of 0.5 %, and further processing in cyclonic separator and bag type dust collector. The operation conditions include air temperature of 125-130 deg.c, water temperature of 70-80 deg.c, average material residence time of 15-25 min, negative pressure operation and temperature in the cyclonic drier of 55-60 deg.c. The apparatus includes mainly screw conveyer, steam heat radiator to heat air, pulse drier, cyclonic drier, cyclonic separator, antistatic bag type dust collector, hot water tank, induced draft fan, etc. The present invention has high drying efficiency, low power consumption, and other advantages.

Description

technical field [0001] The invention relates to a drying method of powder, in particular to a drying method of methyl methacrylate-butadiene-styrene. Background technique [0002] Methyl methacrylate-butadiene-styrene copolymer (MBS) is mainly used as an impact modifier for polyvinyl chloride (PVC) resins. my country is a big producer and consumer of PVC. With the continuous improvement of people's living standards, PVC products have grown rapidly, which has promoted the demand for PVC impact modifiers. [0003] In the production process of MBS, drying is an extremely important link. The dried MBS powder will spontaneously ignite when the temperature exceeds the limit. Some MBS manufacturers have had an accident of spontaneous combustion of MBS powder at 60°C in the dryer. [0004] At present, most domestic MBS manufacturers generally use the airflow-boiling drying method. This drying process has many disadvantages and hidden dangers. There are main...

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Problems solved by technology

[0005] 1. The operation is complicated, and it can only be produced intermittently. The labor intensity is high, and the moisture content of the finished product is difficult to reach a uniform standard.

[0006] 2. Due to the finer powder particles of MBS, the material recovery rate is low, which wastes energy and pollutes the environment

[0007] 3. There are dead angles around the fluidized bed, and the temperature is high, which is prone to material accumulation, and spontaneous combustion will occur if the time is too long

[0011] 1. Two streams of heat medium are used to enter the system for drying, thus causing waste of heat energy

[0012] 2. The drying system is in a positive pressure operation state, which may easily cause material leakage and pollute the working environment

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