Spray tower tray reactor, and system and technology for producing propylene glycol monomethyl ether through using reactor

Abstract

The invention provides a spray tower tray reactor, and a system and a technology for producing propylene glycol monomethyl ether through using the reactor. The spray tower tray reactor comprises a reactor body, and a cavity is arranged in the reactor body; the top of the reactor body is provided with a first material inlet, the sidewall of the reactor body is provided with a second material inlet, and the bottom of the reactor body is provided with a material outlet; and an atomizing nozzle cooperating with the first material inlet, and a first distributor, a second distributor, a multistage tower tray, a liquid collector and a third distributor which cooperate with the second material inlet are sequentially arranged in the cavity from top to bottom. The system comprises the spray tower tray reactor. When the spray tower tray reactor is used to produce the propylene glycol monomethyl ether, the epoxy propane conversion rate is improved, the propylene glycol monomethyl ether selectivity is improved, the alcohol proportion is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a spray tray reactor, a system and a process for producing propylene glycol monomethyl ether by using the same. Background technique [0002] Ethylene glycol monoether, propylene glycol monoether, polyethylene glycol monoether and polypropylene glycol monoether are more commonly used alcohol ether products in industry. Propylene glycol monomethyl ether (PM) is a non-toxic, environmentally friendly and widely used chemical solvent. It is suitable for styrene-acrylic emulsion, acrylic emulsion and latex paint system. It can reduce the film-forming temperature, promote its coagulation and film formation, and ensure the good condition of the coating film. It also has multiple uses in fuel antifreeze, cleaning agent, extraction agent, flexo printing ink, silk screen printing ink, non-ferrous metal beneficiation agent, etc. Propylene glycol monomethyl ether is t...

AI Technical Summary

Problems solved by technology

The process adopts the conditions of alcohol ratio 5-6:1, residence time 1-3h, which has the disadvantages of many side reactions, high energy consumption for later separation, and low production efficiency.

[0008] CN 105585455A discloses a method for preparing ethylene glycol monomethyl ether by a continuous etherification method. The method uses ethylene glycol and methanol as raw materials to carry out etherification reaction on a fixed-bed reactor, and the feed ratio of methanol and ethylene glycol is At least 10:1, the reaction temperature is 100°C-300°C, and the space velocity is controlled at 0.3-3h -1 , there are disadvantages such as large alcohol ratio, high reaction temperature and low production efficiency

[0009] CN 100556881A This invention provides a method for ethylene glycol monoethyl ether, which uses a membrane reactor to vaporize the reaction raw materials and react through the membrane, but the selectivity and yield of ethylene glycol monoethyl ether are low, which is not conducive to scale chemical production

[0010] Compared with the batch synthesis method, although the method for producing alcohol ether products disclosed in the above documents has been improved, the problems of low conversion rate of alkylene oxide, large alcohol ratio, and low production efficiency still generally exist.

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