Method and device for separation treatment of sodium formate in NPG (neopentyl glycol) production technology

Abstract

The invention discloses a method and a device for separation treatment of sodium formate in an NPG (neopentyl glycol) production technology. According to the method and the device, a product NPG and a by-product sodium formate in NPG production are separated with a salt effect technology, sodium formate and NPG start separation through circulation by a separation tank and thermal dehydration and concentration by an evaporator according to difference of NPG density and sodium formate brine density, the sodium formate brine has high density and is settled at the bottom of the separation tank, the NPG solution has low density and floats at the upper part of the separation tank, and white sodium formate with better quality is obtained simultaneously. The purity of the by-product sodium formate obtained through separation is higher than 98%, compared with extraction and heating separation, the salt effect separation technology has the advantages that the steam energy consumption is low, the NPG carrying-out amount of the by-product sodium formate is reduced, the sodium formate benefit is increased, production cost in the NPG production process is effectively reduced, and the profit margin of the NPG product is increased.

Description

technical field [0001] The invention relates to the field of NPG production technology, in particular to a method for separating and treating product neopentyl glycol and by-product sodium formate in NPG production and a device for realizing the method. Background technique [0002] Neopentyl glycol (scientific name 2,2-dimethyl-1,3-propanediol, referred to as NPG) is mainly used in the production of high-grade alkyd resin, and its consumption accounts for 75% of the total consumption; in addition, it is also used in lubricating oil , plasticizers, polyester polyols, flame retardants, pharmaceuticals and pesticides, etc. [0003] There are two industrialized production routes for NPG, namely, the halogenated propanol route and the isobutyraldehyde route. At present, the industrial production of NPG at home and abroad basically adopts the isobutyraldehyde route, that is, isobutyraldehyde and formaldehyde are used as starting materials, and alkali is used as a catalyst. Catal...

AI Technical Summary

Problems solved by technology

[0005] Sodium formate and neopentyl glycol are both soluble in water, and it is difficult to separate them. They must be heated and extracted repeatedly with water under negative pressure, so the energy consumption of steam is relatively large, and the by-product sodium formate after sedimentation and separation contains about 4% neopentyl Diol, 4% Neopentyl Glycol product was brought out to increase production cost

The sodium formate after sedimentation and separation is brown-red and the content is only about 90%. At present, the market value of this sodium formate is relatively cheap, and it is even difficult to sell, thus reducing the profit margin of neopentyl glycol products.

Images