Method and device for preparing methyl chloride and ammonia by utilizing ammonium chloride and methyl alcohol

Abstract

The invention discloses a method and device for preparing methyl chloride and ammonia by utilizing ammonium chloride and methyl alcohol, belonging to the technical field of chemical engineering process and equipment. Two mutually-vertical diaphragms are arranged in the device disclosed by the invention so that a machine tool body is divided into internally-through four regions; the heat supply, the synthetic reaction of methyl chloride, the circulation of a catalyst and the regeneration of a deposited carbon catalyst are completed in the four regions at the same time. By adopting the device and the method in the invention, the transmission problem of a large amount of heat needed in the reaction and the problem of the material quality of the equipment can be solved, the back mixing of the methyl chloride and the ammonia is limited at the axial height of the device, and the effect on inhibiting side reaction is good. The device and the method of the invention has the advantages of high equipment integrated level, simple process, high converted rate, good selectivity and the like, and the device and the method are easy to control.

Description

technical field [0001] The invention belongs to the technical field of chemical technology and equipment, in particular to a device and method for preparing methyl chloride and ammonia by using ammonium chloride and methanol gas-solid phase method. Background technique [0002] In recent years, due to the rapid development of my country's soda industry, a large amount of by-product ammonium chloride has been produced. Ammonium chloride is mainly used to produce compound fertilizers, but there are problems such as the accumulation of chloride ions in the soil when it is applied, and the amount is gradually decreasing. Therefore, new application fields of ammonium chloride should be actively explored. When ammonium chloride is decomposed, hydrogen chloride and ammonia can be generated, but the separation of the two is very difficult. Chloromethane is generated by introducing methanol and hydrogen chloride to react, and ammonia can be recovered at the same time. Methyl chlor...

AI Technical Summary

Problems solved by technology

Although the methyl chloride yield of some embodiments can reach a relatively high level, because the decomposition of ammonium chloride and the synthesis of methyl chloride are carried out in two reaction sections, if the hydrogen chloride produced by the decomposition of ammonium chloride cannot react rapidly with methyl alcohol Consumption, it is possible to block the pipeline due to temperature fluctuations and ammoniation to ammonium chloride during the transportation process

In 2009, Hebei University of Science and Technology proposed in its published patents CN101579611 and CN101574657 that a fluidized bed reactor with a lifting section and a reaction section was used to complete the reaction of ammonium chloride and methanol, and provided a catalyst preparation method, but the whole process The energy consumption is relatively high, and the corrosion problem of hydrogen chloride to the equipment is also relatively serious

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