Method for preparing water gas from p-nitrobenzoyl chloride raffinate

Abstract

The invention discloses a method for preparing water gas from p-nitrobenzoyl chloride raffinate. The method comprises the following steps: (1) vaporizing the raffinate in a primary waste heat recoverer; (2) cracking the vaporized raffinate steam in a plasma cracking tubular reactor; (3) combusting cracked gas obtained in step (2) in a secondary combustion chamber; and (4) enabling the cracked gasobtained in step (3) to sequentially pass through the primary waste heat recoverer, a secondary waste heat recoverer, a water washing tower and an alkaline washing tower, and discharging obtained tailgas through a chimney. An environmentally-friendly plasma system is adopted to treat the raffinate, the system is a set of sealed circulation and non-incineration process, chemical bonds of wastes are decomposed and recombined through a high-energy dense plasma field to form valuable commodities, dioxin is not generated, and zero emission of pollutants can be achieved.

Description

technical field [0001] The invention relates to a method for preparing water gas from p-nitrobenzoyl chloride raffinate. Background technique [0002] p-Nitrobenzoyl chloride is an important intermediate in the synthesis of folic acid, plecaine hydrochloride, N-p-aminobenzoyl-L-glutamic acid and other vitamin pharmaceutical products, and is also widely used in the production of pigments and color developers. Especially in recent years, with the rise of feed industry and the development of information industry, the consumption of p-nitrobenzoyl chloride is increasing. [0003] The common synthetic method is the reflux reaction of p-nitrobenzoic acid and thionyl chloride under the action of a catalyst or the reaction of p-nitrobenzoic acid and phosphorus trichloride under the condition of carbon tetrachloride as a solvent and the reaction of chlorine gas to prepare . [0004] No matter which synthesis route is used, the final product needs to be purified by distillation. Dur...

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Problems solved by technology

These organic residues are complex in composition, highly corrosive, and unstable, and will react chemically with water or even humid air to generate a large amount of toxic and harmful media such as hydrogen chloride.

This kind of raffinate cannot be treated by physical and common chemical methods, but can only be disposed of by incineration. However, due to the presence of a large amount of chlorine and oxygen elements in the molecular structure, and the incineration temperature can only reach the limit temperature of 1200 ° C, so in Dioxin and other harmful substances are easily formed during the incineration process, which will cause serious damage to the human body and the environment

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