Device system and method for continuously producing alkoxy propane

Abstract

The invention provides a device system and method for continuously producing alkoxy propane, and the method comprises the following steps: carrying out condensation reaction on a raw material solution in a filler reaction extraction tower under the action of a solid acid catalyst, and then carrying out countercurrent contact on the raw material solution and an extraction agent to obtain an extraction phase; and carrying out azeotropic distillation on the extract phase in a product refining tower to obtain a target product. According to the method, modified solid acid is used as a catalyst and is matched with an extracting agent, in-situ separation and removal of byproduct water and promotion of right shift of balance are realized through countercurrent contact, the retention time is short, and the conversion per pass can be improved; besides, in the rectification process, due to the existence of the extraction agent, the product separation process is greatly simplified, the number of equipment and energy consumption are remarkably reduced, and the extraction agent is low in price, easy to obtain, capable of being directly recycled and reused, free of subsequent treatment, green and environmentally friendly and has great market competitive advantages.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, in particular to a device system and method for continuously producing alkoxypropane. Background technique [0002] As an important intermediate in the field of fine chemicals, alkoxypropane has the characteristics of high reactivity and strong water absorption due to its unique chemical structure. It is often used as a dehydrating agent, protective agent, condensation agent, and insecticide etc., playing an important role in fine chemical fields such as medicine, pesticide and spices. [0003] At present, the preparation methods of alkoxypropane mainly include indirect method and direct method. Among them, the direct method using alcohol and ketone as raw materials has obtained more advantages due to its cheap and easy-to-obtain raw materials, simple process flow, and easier realization of industrial production. Much favor. The alcohol-ketone condensation reaction is a reversible exothermic r...

AI Technical Summary

Problems solved by technology

Although the product quality and purity of this scheme is relatively high (99%), the total yield is only 70%, and the recycled material contains more products, which inhibits the forward reaction to a certain extent and reduces the conversion rate per pass.

In addition, the resin needs to be regenerated, increasing the complexity of the system

[0009] In summary, at present, the main difficulties in the synthesis of alkoxypropane by the direct method of alcohol and ketone are reflected in the following aspects: 1. The reaction balance is limited, the single-pass conversion rate is low, and the reaction temperature is too low, and the heat transfer equipment requires high requirements. Second, the by-product water in the system will inhibit the positive shift of the equilibrium and reduce the reaction conversion rate. At the same time, the by-product water and the product are azeotropes, and the existing separation scheme cannot directly obtain high-purity products; Third, the raw material alcohol, The ketone and the product are azeotropes. The product refining process requires multiple azeotropic distillation or extractive distillation. The separation process is complicated, the number of equipment is large, and the investment is large.

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