Production method of environmental friendly plasticizer DOTP and production system

Abstract

The invention relates to the technical field of plasticizer production, particularly to a production method of an environmental friendly plasticizer DOTP and a production system. The production method comprises the following steps: feeding a wet material into a twin-screw counter and adding octanol for mixing, then putting into an esterification reactor after preimpregnating, adding an alkaline solution for stirring and washing, controlling a PH value to be neutral, and heating up to evaporate the moisture; utilizing a vacuum effect to continuously add materials; adding a decolorizing agent to improve a decoloring effect; heating up under the vacuum effect, and adding siliceousearth and kaolin into a filter, and filtering to obtain the product. According to the production method, two major raw materials are charged by metering and matching; equipment corrosion is reduced by neutralized water washing; esterification and dealcoholization of the reactor are realized in one reactor; continuous production is realized; the continuous production of material transfer and material charge is realized under the vacuum effect; residues are recycled through processing equipment; the reclamation is realized; the cost is saved, and environment is improved.

Description

(1) Technical field [0001] The invention relates to the technical field of plasticizer production, in particular to a production method and production system of an environmentally friendly plasticizer DOTP. (2) Background technology [0002] Dioctyl terephthalate (DOTP for short) is a kind of plasticizer with excellent performance. It has good electrical and thermal properties. It has good speed-up effect and low volatility when used in cable materials. It is widely used in heat-resistant It is an ideal plasticizer for producing temperature-resistant 70°C cable materials and other eyeball-resistant volatilization-resistant PVC products. It has good cold resistance and is an excellent environmentally friendly plasticizer. [0003] The existing DOTP production equipment is relatively complicated, and must be dealcoholized in a dealcoholization kettle after the esterification is completed. The production efficiency is low, continuous production is not possible, and the investme...

AI Technical Summary

Problems solved by technology

[0003] The existing DOTP production equipment is relatively complicated, and must be dealcoholized in a dealcoholization kettle after the esterification is completed, the production efficiency is low, continuous production is not possible, and the investment is large, the product quality is not high, and the yield is low

Problems and shortcomings of the existing technology: coarse material with high moisture content needs to be dried, the raw material contains hydrochloric acid radicals, which severely corrodes the equipment, the equipment life is short, the equipment configuration is unreasonable, the utilization rate is low, continuous production is not possible, the production efficiency is low, and the amount of residue more difficult to handle

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