Recovery and separation method of light component raffinate in carbonylation production process of butanol-octanol

Abstract

The present invention provides a recovery and separation method of light component raffinate in a carbonylation production process of butanol-octanol. The recovery and separation method comprises that: 1) after the raw material in a butanol-octanol raffinate raw material tank is pressurized, feeding is performed from the middle portion of a light removing tower, and heating is performed to make the material in the tower kettle be vaporized; 2) the light component at the tower top is condensed, the condensed light component enters a reflux tank, one part is subjected to reflux, the other part is extracted and then enters a light component receiving tank, and the material at the tower bottom is extracted from the bottom portion and then enters a kettle liquid buffer tank; and 3) after the material in the kettle liquid buffer tank is pressurized, feeding is performed from the middle portion of a rectification tower, heating is performed through a thermosyphon reboiler, the material in the tower kettle is vaporized, the octanol steam at the tower top is condensed, the condensed octanol steam enters the reflux tank, one part is subjected to reflux, the other part is extracted to obtain the octanol product, and 2-propyl heptanol is extracted from the tower bottom, and is conveyed to a material tank zone product tank through a tower kettle material discharge pump. According to the present invention, the secondary pollution in the environment is reduced, the carbon dioxide emission is reduced, the waste resources are utilized, and the original direct incineration is changed into the purification so as to achieve the purposes of no harm, minimization, and resource.

Description

technical field [0001] The invention belongs to the field of raw material production of fine chemical products, and in particular relates to a method for recovering and separating light component raffinate in the process of producing butanol and octanol by carbonylation. Background technique [0002] Butanol (butylalcohol) and octanol (2-ethylhexanol) can be produced by hydroxyl synthesis in the same device, so it is used to be butylalcohol. Butyl octanol is a colorless, transparent, flammable oily liquid with a special odor, can form azeotropes with water and various compounds, and has moderate toxicity. It is an important raw material for the synthesis of fine chemical products, mainly used in production Plasticizers, solvents, dehydrating agents, defoamers, etc. [0003] At present, the main production method of butanol is the propylene carbonyl method, which is divided into high-pressure method and low-pressure method. The high-pressure method is that olefins, carbon m...

AI Technical Summary

Problems solved by technology

However, the treatment method provided by it is too extensive, and only roughly separates the light components and heavy components in the butanol raffinate, but does not provide specific components for the butanol raffinate. As is known to all, the butanol raffinate contains C4-16 compounds such as various alcohols, aldehydes, alkenals, acetals, acids, esters, and a small amount of water, up to dozens of components, but this open patent only Divide it into light components and heavy components for separate treatment, which is equivalent to no treatment, and it is still difficult to recover butanol from butanol raffinate, resulting in low recovery rate