Method for decomposing sodium phenolate using low CO2-content exhaust gas

Abstract

The present invention relates to a production method for decomposing sodium phenolate by using low-content CO2 waste gas. The method comprises the following steps: the low-content CO2 waste gas is used, the temperature of the CO2 waste gas is reduced to between 40 and 60 DEG C through a cooling device, vapor and foreign matters in the CO2 waste gas are cleared away, and then the CO2 waste gas is pumped to a decomposing tower and an acidifying tower through a fan; the sodium phenolate is warmed up by steam and then is put into the decomposing tower to contact the low-content CO2 waste gas, and the temperature in the decomposing tower is between 40 and 60 DEG C; under the action of internal parts of the decomposing tower, thermal transfer and mass transfer are realized to decompose the sodium phenolate into crude carbolic acid and sodium carbonate; and the sodium phenolate is sprayed from the top of the decomposing tower to contact reverse current of the low-content CO2 waste gas so that the sodium phenolate is decomposed into the crude carbolic acid and the sodium carbonate which are separated to obtain a crude carbolic acid product and sodium carbonate solution after being kept stand, wherein the sodium carbonate solution is causticized into sodium hydroxide solution through calcium oxide, and the sodium hydroxide solution is used as a raw material for distillate washing to perform circulation. The production method makes full use of the characteristics of distillate processing and the prior resources of deep-processing enterprises to realize the standard emission of the waste gas to be emptied.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a method of using low-content CO 2 A method for decomposing sodium phenate by waste gas. Background technique [0002] my country is a country short of oil, gas, and rich in coal resources. With the great development of my country's coke industry, it has greatly promoted the development of deep processing of coal tar, a by-product of coke production. The chemical industry uses coal as a raw material industry chain, and The development of coal-based chemical industry is an inevitable trend, and it is the basic feature of my country's chemical industry. According to estimates, based on the annual output of 140 million tons of coke in the country, 49 million tons of coal tar can be produced by-product per year. Due to the comprehensive utilization of heavy coke production and light chemical production in China's coking industry, and because the scale is not concentrated, the system ...

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Problems solved by technology

Sulfuric acid consumes a lot in the production of this method, and the sodium sulfate solution waste treatment difficulty that produces is big, and the refined phenol product quality that the crude phenol product that it obtains is refined to obtain is on the low side, and yield is lower than CO 2 Crude phenol obtained by decomposing sodium phenate from waste gas is about 1.2% lower

Moreover, the method is backward in technology, poor in operating conditions, and severely corroded in equipment, which is not conducive to continuous and stable production, and cannot realize recycling

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