Continuous treatment process and device of neopentyl glycol condensed washing mother liquor

Abstract

The invention relates to a continuous treatment device of neopentyl glycol condensed washing mother liquor. The device is characterized by comprising a filter, a primary preheater, a secondary preheater, a rectifying tower, a chromatographic device and a cyclone hydraulic separator, wherein the filter is arranged at the front end of the primary preheater, the primary preheater is connected with the secondary preheater through a pipeline, the rectifying tower is arranged at the rear end of the secondary preheater, a return tank and the chromatographic device are arranged on the top of the rectifying tower, and the cyclone hydraulic separator and a reboiler are arranged on the bottom of the rectifying tower. The invention relates to a continuous treatment process flow of neopentyl glycol condensed washing mother liquor capable of continuously and stably removing organic impurities in the neopentyl glycol condensed washing mother liquor and condensing neopentyl glycol.

Description

technical field [0001] The invention belongs to the separation field of the pharmaceutical industry, and in particular relates to a continuous treatment process and device for neopentyl glycol condensation water washing mother liquor. Background technique [0002] Neopentyl glycol, referred to as NPG, is a white crystalline solid, easily soluble in water, low-carbon alcohols, low-carbon ketones, ethers and aromatic compounds. At present, the synthesis methods of neopentyl glycol mainly include hydrogenation method and methanol method. Neopentyl glycol molecule has a specific neopentyl structure, which contains two primary carbonyl groups, and there is no α-hydrogen atom on the central carbon atom. These characteristics make neopentyl glycol have high thermal and chemical stability , Therefore, it is often used in the production fields such as medicine, chemical industry, paint, pesticide, plastic and petroleum. Among them, in the pharmaceutical industry, neopentyl glycol c...

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Problems solved by technology

[0004] The existing steam equilibrium distillation process has the following problems: first, the loss of neopentyl glycol is large during the treatment process, and the mass fraction of neopentyl glycol in the wastewater produced from the top of the tank is 2 to 3%, and every ton of neopentyl glycol is processed Alcohol condensation water washing mother liquor, the loss of neopentyl glycol is 20-30 kg; second, the operation period is long, and it takes 20-22 hours to process a batch of 20 tons of neopentyl glycol condensation water washing mother liquor, and the production efficiency is low; third , the color of the treated neopentyl glycol solution is yellowish, and it needs to be decolorized by activated carbon before it can be recycled. The existing process adopts intermittent treatment, and the solution in the tank is kept at high temperature for a long time, resulting in partial carbonization of the organic matter in the solution, and the color is yellowish. 4. Scaling easily occurs in the neopentyl glycol distillation tank, which leads to deviation of heat transfer effect. The neopentyl glycol condensation washing mother liquor contains a small amount of calcium sulfate. After a large amount of water is steamed out by balanced distillation, the calcium sulfate in the tank gradually Accumulation leading to scaling inside the retort walls

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