Method for improving raffinate product yield of acetonitrile-process 1,3-butadiene extracting apparatus

Abstract

The invention discloses a method for improving raffinate product yield of an acetonitrile-process 1,3-butadiene extracting apparatus. The method comprises the following steps: allowing an acetonitrile solvent with dissolved C4 alkyne to enter the central part of an alkyne flash evaporation tower; allowing residual C4 from an MTBE/butylene-1 apparatus to enter the upper part of the alkyne flash evaporation tower as diluent gas; separating C4 alkyne gas containing vinylacetylene out from the alkyne flash evaporation tower through flash evaporation; and cooling the C4 alkyne gas and discharging the cooled C4 alkyne gas from the top of a return tank in the form of noncondensable gas; wherein the residual C4 is one or more selected from the group consisting of deisobutanizer top gas, deisobutanizer top noncondensable gas and butylene-1 rectifying tower bottom C4. The method provided by the invention enables the raffinate product yield of the 1,3-butadiene extracting apparatus to be 100% and operation of the apparatus not to be influenced at the same time, so economic benefits of a butadiene apparatus and the downstream MTBE/butylene-1 apparatus are improved, the concentration of vinylacetylene in C4 alkyne is further reduced, and security of the butadiene extracting apparatus is enhanced.

Description

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AI Technical Summary

Benefits of technology

This patented technology improves on an existing process by adding another component called 3-Butanol (B) instead of relying solely upon either ethyleneglutaron or hexamethylenediamine (HMDI). By doing this B2 additionally extracting vinylacetyne from crude oil with alcohols like methane, it increases production efficiency while reducing unwanted side products such as formaldehyde. Additionally, there may also be added useable components other than just water used during the separation processes themselves which further enhances the overall effectiveness of these methods. Overall, this new technique makes producing high purity vinylic acid more cost-effective without compromising its quality.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the efficiency at producing specific types of chemical called hexa-2Butane or 2C4BN. These compounds have unique properties such as being stable under extreme conditions like heating and cooling without decompositing over time. However, current methods involve collecting these gases away beforehand making it difficult to recover their value effectively because they can lose valuable substances during storage.

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