Method and device for producing thiophene and derivative thereof in direct-cooled mode

Abstract

The invention discloses method and device for producing thiophene and a derivative thereof by synthesizing butadiene and sulfur. The production method comprises the steps of reaction, separation and desulfurization. In the reaction process, an intermediate frequency furnace is adopted to heat raw materials to initial reaction temperature; the reaction is carried out in a gas phase under normal pressure at the temperature of 360-460 DEG C; the molar ratio of the sulfur to the butadiene is 0.9-1.5, the molar ratio of water to the butadiene is 0.5-3, and the retention time of the reaction is 0.3-5 seconds. The reaction product is directly cooled by water spraying; thiophene in a gas phase is recovered by vaporizing and cooling the raw material butadiene; then tar generated in the reaction isused for absorbing the thiophene recovered again in a gas phase; and the yield of the thiophene is 40-50 percent. A steam stripping method is firstly used for separating the thiophene from the tar inthe reaction product, and then the steam stripped thiophene is rectified to obtain a finished thiophene product with a purity of 99.6-99.8 percent. The method and the device can be used for producingthiophene derivatives such as 3-methyl thiophene, and the like.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a production method of thiophene and its derivatives and a device for implementing the method. Background technique [0002] Thiophene is the transliterated name of Thiophene in English, and it is also called a thiadiene pentacyclic ring and thiamolo in Chinese. Thiophene is the most important sulfur heterocyclic compound, mainly used in the production of pharmaceutical intermediates, and is also widely used in the synthesis of pesticides, dyes, polymer additives, etc. As an important pharmaceutical raw material, thiophene derivatives synthesized from thiophene are used to synthesize hundreds of drugs such as cephalosporins and cephalosporins. [0003] The earliest production method of thiophene was extraction from the pickling solution of the benzene fraction of coal tar. Meets the requirements of the pharmaceutical industry. This method has long been eliminated and replaced by...

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Problems solved by technology

Chinese patent application (publication numbers are CN 1335313A and CN 1420116A) discloses the production process and equipment of butadiene-sulfur to synthesize thiophene, the reaction product is only cooled by a circulating water condenser, thiophene is lost in a large amount from the tail gas, and 1 ton of thiophene raw material is produced The consumption of butadiene (unit consumption) former is 1.4 tons (yield 46%), and the latter is 1.8 tons (yield 36%); Heating the reactor is completely unnecessary because the reaction is an exothermic reaction, but because the resistance wire is used to heat the reaction raw materials, the inlet temperature of the reactor is relatively low, and the reactor has to be heated, resulting in high energy consumption , the reactor is coked and blocked; in addition, the reactors of the above two Chinese patent applications are filled with fillers, and no corresponding technical effect has been achieved, which makes the reactor coked and blocked faster

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