Introduction to ACN Butadiene Plant
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That expert, could you please explain the acetonitrile method for butadiene processing? I’d like to know more about it
Adding a certain amount of acetonitrile to the C4 fraction can significantly increase the relative volatility among the various components. Utilizing this principle, two-stage extractive distillation processes—butadiene extractive distillation and alkyne extractive distillation—are employed to remove butane, alkenes, and tetraalkynes (butyne, vinyl acetylene) from C4 hydrocarbons, thereby obtaining crude butadiene. Further secondary distillation is then used to eliminate heavier components such as C5 hydrocarbons as well as propyne, ultimately yielding butadiene suitable for polymerization purposes. The “QJ-ACN” extraction technology was developed jointly by the Organic Synthesis Plant of Jilin Petrochemical Company under China National Petroleum Corporation and Qingdao Ecos Technology Engineering Co., Ltd. www.ecss.com.cn
What is the function of those subsequent water scrubbing towers?
In the butadiene washing tower, there is no change in the composition of the flow streams; what is the function of this tower?
Generally, there is a wash tower for raffinate oil to remove acetonitrile from the raffinate oil (butane, butenes); a wash tower for alkynes to remove acetonitrile from alkynes; a wash tower for dimers to eliminate impurities from the circulating solvent (this tower can be combined with the alkyne wash tower into one); and a butadiene wash tower to remove acetonitrile from crude butadiene