Treatment method of maleic anhydride production waste liquid

Abstract

The invention discloses a treatment method of maleic anhydride production waste liquid. The treatment method comprises the steps: waste liquid is pumped into a preheater for preheating, the preheatedwaste liquid sequentially enters a first-effect heating chamber, a second-effect heating chamber and a third-effect heating chamber for evaporating and concentrating, and then the concentrated liquidenters an incinerator to be treated and the gas phase enters a condenser to be condensed, wherein the first-effect heating chamber uses live steam for evaporation, steam generated by the first-effectheating chamber is used as a heat source of the second-effect heating chamber, steam generated by the second-effect heating chamber is used as a heat source of the third-effect heating chamber, and avacuum pump is used for maintaining negative pressure operation of the third-effect heating chamber. According to the treatment method, multiple-effect evaporation is adopted to concentrate the wasteliquid, the amount of used steam is small, the production operation cost can be reduced and the energy-saving and consumption-reducing principle is met.

Description

technical field [0001] The invention relates to the technical field of compound production, in particular to a treatment method for maleic anhydride production waste liquid. Background technique [0002] Maleic anhydride is the abbreviation of maleic anhydride, also known as maleic anhydride and 2,5-furandione. It is currently the third largest anhydride in the world after phthalic anhydride and acetic anhydride. Maleic anhydride has a strong pungent smell, is insoluble in petroleum ether and carbon tetrachloride, soluble in ethanol, ether and acetone, is orthorhombic, colorless needle-like or flaky crystals. It is mainly used as a raw material for the production of 1,4-butanediol, γ-butyrolactone, tetrahydrofuran, succinic acid, unsaturated polyester resin, alkyd resin, etc. It is also used in medicine and pesticides. [0003] In the past, maleic anhydride was prepared by catalytic oxidation of benzene, but now the benzene method is gradually replaced by n-butane oxidation...

AI Technical Summary

Problems solved by technology

Among them, the solvent DBP has a benzene ring, and DIBE has a saturated six-membered ring. The COD value of the sewage is about 20,000-30,000 mg / L, the pH value is 1-2, the B / C ratio is low, and the biodegradability is poor.

[0004] At present, biochemical treatment is mostly used in industry, but due to the poor biodegradability of the sewage, pretreatment, anaerobic treatment, aerobic treatment, post-treatment, etc. are required, the process is long, the floor area is large, the investment is large, and the operation and maintenance are complicated. ; There are also industrial installations that use the traditional incineration method to spray the waste liquid into the direct-fired incinerator, but this method needs to consume a large amount of fuel gas, which is economically unreasonable; although the wet oxidation method can treat waste liquid containing benzene rings and is difficult to biochemically , but due to the need for high temperature and high pressure conditions, there are also disadvantages of high energy consumption and uneconomical

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