Method for refining J acid by using multi-functional integrated device

Abstract

The invention provides a method for refining J acid by using a multi-functional integrated device, which comprises alkaline water dissolution, salting out, filtering, washing, clear water dissolution integrated process and decoloration, filtering, washing integrated process and the acidification, filtering, washing, and drying integrated process, the alkaline water dissolution, salting out, filtering, washing, and clear water dissolution integrated processes are completed in a first multi-functional device integrating filtering, washing and drying into a whole and decoloration, filtering, washing integrated processes are completed in a second multi-functional device integrating filtering, washing and drying into the whole, and the acidification, filtering, washing, drying integrated processes are completed in a third multi-functional device integrating filtering, washing and drying into the whole. The method has the advantages of a small number of devices, small occupied area, high degree of automation, low loss of raw materials, easy realization of large-scale continuous operation and the like, and can be widely applied in dye production, organic chemical industry and other fields.

Description

Technical field [0001] The invention relates to a method for refining medium acid with multifunctional integrated equipment, which belongs to the fields of dye technology and organic chemical industry. Background technique [0002] Acid is a dye intermediate, which can be used to produce dimethic acid, scarlet acid, phenyl acid, direct dyes and reactive dyes. The intermediate acid content of the crude industrial product is only about 90%, which also contains water, gamma acid and other insoluble substances, so it usually needs to be refined before use to remove the original impurities in the crude product and obtain the fine intermediate acid. [0003] The refining of medium acid mainly includes the steps of dissolving in alkaline water, salting out, filtering, washing, dissolving in clear water, decolorizing, filtering, washing, acid precipitation, filtering, washing, drying and so on. Among them, each step of filtering and washing must be repeated Many times, it is accompanied b...

AI Technical Summary

Problems solved by technology

In the existing refining method, each step is carried out separately, and about 1.7 to 1.8 tons of crude medium acid are consumed for each ton of fine medium acid produced, so there are many equipments, large floor area, high labor intensity, low production efficiency, and large loss of raw materials And other issues

[0004] At present, in the pharmaceutical, chemical, pesticide, food and other industries, a multifunctional equipment integrating filtration, washing and drying is widely used. This equipment can replace filtration and drying equipment (suction filter, press filter, double cone drying device, drying oven, etc.), complete the process of stirring, temperature control, filtration, washing, drying, solid unloading, etc. in the same equipment, but this equipment has not been used in the media acid refining process.

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