A kind of treatment method of waste acid water

Abstract

The invention relates to a waste acid water treating method. Waste acid water is produced in the process of preparing methacrylic acid or methacrylate substances by adopting an ACH method. The waste acid water treating method is characterized in that the waste acid water and ammonia gas are added into a reactor to perform intermittent reaction, so that the ammonia gas is completely absorbed, and gas out of the top of the reactor is directly used for rectification and separation. The waste acid water treating method has the multiple advantages of being short and simple in treatment process, easy to operate and low in investment cost and adopting few devices.

Description

technical field [0001] The invention relates to the treatment of by-product waste acid water in the production of methyl methacrylate, in particular to a treatment method of waste acid water. Background technique [0002] Methyl methacrylate (MMA) is an important organic chemical raw material, mainly used in the field of polymerization and copolymerization, and is the most important chemical industry product among methacrylates. The application of MMA covers all aspects of society, involving construction, electronics, medical care, aerospace, automobiles and other fields, and its demand is increasing, especially in the pursuit of high-performance polymer materials, methyl methacrylate materials are in huge demand and become R&D hotspots. [0003] At present, the production methods of MMA mainly include ACH method, isobutylene method and ethylene method. As a traditional and mature production process, the ACH method is the most widely used in the world, accounting for 75% o...

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Problems solved by technology

The ACH method is characterized by the effective use of petrochemical by-product HCN, and the high yield of MMA. At the same time, with the continuous improvement and perfection of the process, its production advantages are more obvious, but the process still has the following disadvantages: process production has by-product waste acid Water, which is highly acidic, requires high quality equipment; the process of using waste acid water to recover by-product ammonium sulfate is complicated, resulting in relatively large investment in subsequent environmental protection treatment of condensate and waste gas

[0006] (2) The amount of organic light mother liquor is 0.4-0.5t / t, and 10-20% of ammonium sulfate is entrained, causing SO in the tail gas of waste liquid incineration 2 The content is as high as 8000-10000ppm, resulting in the need for desulfurization treatment of tail gas;

[0007] (3) Waste acid water contains 0.1% MMA, 0.5% methanol, 0.1% acetone, 0.4% methacrylic acid sodium salt, 5.5% methacrylic acid polymer, 0.3% methacrylic acid and methacrylic acid oligomer substances, a small amount of α-hydroxyisobutyric acid, acetone monosulfonic acid, acetone disulfonic acid, etc. During the neutralization of these organic substances with ammonia, the acidic organic substances will generate corresponding ammonium salts, but high polymers, oligomers Organic substances such as acetone, methanol, and MMA overflowed from the upper part of the reactor, entraining a large amount of ammonium sulfate solution; some organic substances dissolved in the reaction solution also affected the crystallization of ammonium sulfate;

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