Guangzhou Petrochemical Continues to Optimize and Improve the Purity of Butene-1 Products

Recently, the conversion rate of isobutene in Guangzhou Petrochemical MTBE/butene-1 unit has decreased, which not only reduces the output of MTBE (methyl tertiary butyl ether), but also increases the isobutene content in the downstream butene-1 product, resulting in the purity of the butene-1 product. has declined.

A research team was established in the heavy catalysis gas addition area. After consulting a large number of materials, referring to the advanced experience of similar devices and fully communicating with catalyst manufacturers, the research team found the main reason for the decline in the conversion rate of isobutene: the flow of vapor and liquid phases in the catalytic distillation column bed The space increases, the pressure difference decreases, the reaction contact residence time of methanol and isobutene in the catalyst bed in the catalytic distillation tower is too short, and the reaction depth decreases, resulting in a decrease in the conversion rate of isobutene, and excessive isobutene is brought into the downstream butene-1 unit, causing The purity of the butene-1 product decreased.

After finding the reason, the research team decided to increase the reaction rate of isobutene and methanol by controlling the reflux temperature at the top of the catalytic distillation column to increase the sensitive temperature of the catalyst bed. The load of the distillation column increases the residence time of isobutene and methanol in the catalytic distillation column, so as to achieve the purpose of increasing the depth of reaction.

Through continuous research and optimization, under the condition of full-load operation of the device, the conversion rate of isobutene increased by 0.24 percentage points compared with that before optimization; the isobutene content of the butene-1 unit raw material was reduced by 0.09 percentage points compared with that before optimization, and the product purity of butene-1 was higher than that before optimization. It was improved by 0.5 percentage points before optimization.