Device and method for recycling trichloroethane in production of sucralose

Abstract

The invention relates to a device for recycling trichloroethane in production of sucralose. The device is characterized in that to-be-recycled trichloroethane and wastewater at the top of a DMF (dimethylformamide) rectification column are connected with an inlet of a washing mixer, the washing mixer is sequentially connected with a layering device, a trichloroethane receiving tank, a first atmospheric distillation column, a vacuum rectification column, a three-stage washing mixer and a second atmospheric distillation column, and a bottom outlet of the vacuum rectification column is sequentially connected with a raffinate tank and a layering kettle; an upper outlet of the layering device is connected to an DMF recycling section, a top outlet of the first atmospheric distillation column is connected to the washing mixer and the layering kettle, an upper outlet of the three-stage washing mixer is connected to the washing mixer, and an upper outlet of the layering kettle is connected to aDMF rectification system. The device has the advantages that the process is simple, the equipment investment cost is low, and the device is convenient to operate; DMF in the trichloroethane is effectively recycled, consumption of washing water is reduced greatly, the standard of zero wastewater discharge is met, the cost is saved, and the environment is protected.

Description

technical field [0001] The invention belongs to the technical field of sucralose production, and relates to a device and method for recovering trichloroethane in sucralose production. Background technique [0002] As a new type of sweet food additive, sucralose has more advantages than sucrose, saccharin, AK sugar, aspartame, stevioside, etc. It has high safety and stable performance, and is a new type of high-quality , non-nutritional high-efficiency sweetener, is the best ideal sweet substitute for food for obesity, cardiovascular disease and diabetes patients; it also belongs to the field of fine chemical products, and is a branch product of food additives. It is not only widely used in health food and medicine, but also widely used in more than 300 kinds of processed products such as baked food, beverage, chewing coffee, dairy products, frozen snacks, ice cream, pudding, jelly, jam, syrup, etc. , has been widely accepted by the market and has become one of the most popu...

AI Technical Summary

Problems solved by technology

[0003] However, the consumption of trichloroethane in the production process of sucralose has been seriously restricting the development of the sucralose industry. At present, the method of processing trichloroethane to be recovered is vacuum distillation, which will produce a large amount of waste water. Complicated, resulting in dilute DMF in wastewater cannot be recycled

At present, our method of producing and recovering trichloroethane from sucralose is to wash and remove impurities with a large amount of water to ensure that the content of recovered trichloroethane reaches the standard. Due to the large amount of water, the content of DMF is too low due to dilution, and lost The value of recycling, and generate a lot of waste water

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