Semi-continuous production process for acetyl tributyl citrate

Abstract

The invention discloses a semi-continuous production process for acetyl tributyl citrate (ATBC) serving as an environment-friendly plasticizer, which has a process route that comprises the steps of esterification, dealcoholization, acetylation, deacidification, neutralization and washing, steam stripping, waste water treatment and filtration. For overcoming the drawbacks of the conventional process, the process has a redesigned process flow, realizes continuous operation in the dealcoholization step and the deacidification step of a production device, achieves high production efficiency and stable product quality, changes the flow of a vacuum system in the deacidification step and increases a tail gas alkaline cleaning process. The process adopts the waste water treatment process to perform the dealcoholization and desalination of neutralized waste water to solve an environment protection problem. A whole set of device is a set of semi-continuous production device. Each production line is designed with an annual production capacity of 10,000 tons.

Description

technical field [0001] The invention belongs to the production process of environment-friendly plasticizers, in particular to a semi-continuous production process of acetyl tributyl citrate. Background technique [0002] Tributyl citrate (TBC) and acetyl tributyl citrate (ATBC) are currently popular non-toxic plasticizers abroad, and both have been certified as non-toxic products by the US Food and Drug Administration (FDA). Acetyl tributyl citrate is less toxic than tributyl citrate, and both can be added to food. As the main plasticizer, tributyl acetyl citrate has strong solubility, good oil resistance, good light resistance, and good mildew resistance. It has good compatibility with most cellulose, polyvinyl chloride, polyvinyl acetate, etc., and is mainly used as a plasticizer for cellulose resin and vinyl resin. After being plasticized, PVC has the advantages of good low-temperature flexibility, heat stability and no discoloration during fusing and sealing. Acetyl t...

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Problems solved by technology

[0005] According to the above, the traditional full-batch production equipment generally includes an esterification kettle, a dealcoholization kettle, an acetylation deacidification kettle, a neutralization stripping kettle, and a decolorization kettle. It must be poured into another reactor, the time for pouring is long, the production operation is basically done manually, the labor intensity is high, the product quality is unstable, the production scale of the device is small, and the volume of the reactor is 8M 3 According to calculations, the annual output of each production line is less than 5,000 tons, and there is no neutralization wastewater treatment system, causing serious pollution

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