Method for drying polycarbonate

A polycarbonate and drying technology, which is used in drying solid materials, heating to dry solid materials, drying, etc., can solve the problems of high investment cost of centrifugal separator equipment, inability to apply modern fine production, and high equipment investment cost. The residence time can be controlled to avoid the effect of flammable and explosive, and the residence time is short

Active Publication Date: 2014-03-19
甘肃银光聚银化工有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The combination of spray drying + rake drying has problems such as high equipment investment costs, complex equipment structure, and poor operational stability.
Centrifugal separation + drum combination method has the problems of high investment cost of centrifuge equ

Method used

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  • Method for drying polycarbonate

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Embodiment 1

[0022] The previous process generates 500kg / h polycarbonate powder, which contains a certain amount of water and solvent. The polycarbonate wet powder enters the paddle dryer 1 through the star-shaped feeder, and 0.1~0.6Mpa water vapor is introduced into the hollow paddle blade of the paddle dryer 1 and the jacket of the equipment shell, and passes through the paddle dryer. 1 After drying, the water content in the polycarbonate powder is 1-10%, and the methylene chloride content is 100-1000ppm. The powder enters the fluidized bed dryer 2 through the star feeder. The vaporized dichloromethane solvent is transported by the induced draft fan 5 to the solvent washing tower 6 for wet dust removal and cooling after dedusting. The cooled dichloromethane enters the condenser 7 to be condensed and recycled. The polycarbonate powder entering the fluidized bed dryer 2 undergoes a strong mass and heat transfer process so that the final water content is controlled below 1000ppm. At this t...

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Abstract

The invention relates to a method for drying polycarbonate. The method for drying polycarbonate is characterized by comprising the following steps: a. firstly, desorbing and recycling a dichloromethane solvent in polycarbonate powder by a paddle dryer; and b. then drying the polycarbonate powder deeply by a fluidized bed dryer, wherein cycling thermal nitrogen serves as a fluidized bed drying medium. The polycarbonate powder is dried by adopting a two-stage drying technology method, and the recycling issue of the dichloromethane solvent in the process of drying the polycarbonate powder is solved effectively as well as the drying effect is achieved; the accident hazard of flammable and combustible dust of the polycarbonate drying system is prevented; and the safety of the polycarbonate drying system is improved.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for drying polycarbonate. Background technique [0002] Polycarbonate plastic has excellent transparency, impact resistance, heat distortion resistance, good weather resistance and other properties, and has become one of the fastest growing varieties of engineering plastics. Polycarbonate plastic processing includes injection molding, extrusion, molding, blow molding and other methods. The polycarbonate plastic processing process has very strict requirements on the moisture content of the raw materials. When the polycarbonate raw materials are not dried well, the trace moisture in the raw materials processed at high temperature will cause the polycarbonate products to produce white turbidity, silver threads and bubbles, which will seriously affect product performance. [0003] The polycarbonate powder produced by the current process contains polycarbonate, ...

Claims

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Application Information

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IPC IPC(8): B29B13/06F26B3/08C07C19/03C07C17/38
Inventor 马瑞进付振波李晓明毛志红李小利
Owner 甘肃银光聚银化工有限公司
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