Method for preparing carbon black by plasma cracking of p-nitrobenzoyl chloride residual liquid

Abstract

The invention discloses a method for preparing carbon black by plasma cracking of p-nitrobenzoyl chloride residual liquid, which comprises the following steps: (1) heating and gasifying the p-nitrobenzoyl chloride residual liquid; (2) directly spraying the gasified residual liquid into a plasma torch of a plasma cracking reactor, and cracking at high temperature to form carbon black and cracking gas; (3) sequentially introducing the carbon black and cracking gas generated in the step (2) into a waste heat recovery device and a spray quench device, and introducing the carbon black and the cracking gas into a supplementary collector after the spray quench device is cooled, and the supplementary collector collecting the carbon black; (4) successively introducing the cracking gas discharged from the replenishment collector in the step (3) into a water washing tower and an alkali washing tower, and then discharging from a chimney. The invention adopts an environment-friendly plasma system to treat waste liquid. The system is a set of sealed circulation and non-incineration process. The chemical bonds of waste are decomposed and reorganized by using a high-energy intensive plasma field to convert the waste into valuable commodities without dioxin generation and zero emission of pollutants.

Description

technical field [0001] The invention relates to a method for preparing carbon black by plasma cracking 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 ...

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Problems solved by technology

[0005] These organic waste liquids are complex in composition, highly corrosive, and unstable. They 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 residual liquid cannot be treated by physical or common chemical methods, but can only be treated by incineration. However, due to the presence of a large amount of chlorine and oxygen elements in the molecular structure, and the temperature of ordinary incineration can only reach the limit temperature of 1200 ° C, so Dioxins 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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