22876-20-6Relevant articles and documents
High-efficiency low-pollution fenoxaprop-p-ethyl production process
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Paragraph 0032-0040; 0053-0062; 0076-0084, (2021/07/31)
The invention discloses a high-efficiency and low-pollution production process of fenoxaprop-p-ethyl. The production process comprises the following specific steps: (1) preparing fenoxaprop-p-ethyl; S1, preparing sulfydryl-6-chlorobenzoxazole; S2, preparing 2,6-dichlorobenzoxazole; and S3, synthesizing the fenoxaprop-p-ethyl. According to the fenoxaprop-p-ethyl, fenoxaprop-p-ethyl is finally synthesized through preparation of sulfydryl-6-chlorobenzoxazole and preparation of 2,6-dichlorobenzoxazole, the technology is simple, operation is convenient, efficiency is high, the speed is high, the production cost is saved, the income is increased, and filter residues generated in the production process can be safely treated through the technology; the waste gas enters a waste gas treatment facility for treatment and is discharged after reaching the standard; and the wastewater is desalted, removed salt is washed and dried by methanol to serve as a byproduct, and evaporated condensate water enters a factory sewage treatment station to be treated, so that the aim of protecting the environment is fulfilled, and the functions of high efficiency and low pollution are achieved.
Synthesis method of 2-mercapto-6-chlorobenzoxazole
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Paragraph 0007; 0017-0022, (2020/07/28)
The invention discloses a method for continuously synthesizing 2-mercapto-6-chlorobenzoxazole by a micro-channel reactor, and belongs to the technical field of organic synthesis processes. The methodcomprises the specific steps: performing ring opening on 6-chlorobenzoxazolone in a sodium hydroxide solution to obtain precursor salt, performing continuous sulfhydrylation cyclization reaction on the precursor salt and carbon disulfide in a micro-channel reactor, and performing acidification, centrifugation and drying to obtain a 2-mercapto-6-chlorobenzoxazole refined product. Compared with a traditional intermittent synthesis method of 2-mercapto-6-chlorobenzoxazole, the method has the advantages that the utilization rate of carbon disulfide is increased, the amount of three wastes is reduced, and particularly, safety accidents such as material flushing and unorganized emission of hydrogen sulfide are avoided. The method is simple to operate, high in product yield, good in quality and more beneficial to industrial production.
Method for preparing 2-chlorobenzoxazole and 2,6-dichlorobenzoxazole from o-aminophenol by taking solid triphosgene as chlorinating agent
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, (2018/12/05)
The invention provides a method for preparing 2-chlorobenzoxazole and 2,6-dichlorobenzoxazole from o-aminophenol by taking solid triphosgene as a chlorinating agent. The method comprises the followingsteps: step 1, respectively preparing 2-benzoxazolone and 2-mercapto benzoxazole by taking the o-aminophenol as a raw material; step 2, preparing the 2-chlorobenzoxazole by taking the 2-mercapto benzoxazole as a raw material and the solid triphosgene as the chlorinating agent; step 3, preparing 6-chlorobenzoxazolone by taking TCCA and the 2-benzoxazolone as raw materials; step 4, preparing 2-mercapto-6-chlorobenzoxazole; step 5, preparing the 2,6-dichlorobenzoxazole by taking the 2-mercapto-6-chlorobenzoxazole as a raw material and the solid triphosgene as the chlorinating agent. The method provided by the invention is a brand-new preparation method, which has the advantages of less corrosion to equipment, high yield, less reaction time, mild reaction conditions, less by-products and reduced environmental pollution.
