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Liu L.,Tianjin University | Quan X.-Y.,Tianjin University | Huang Z.-Q.,Tianjin University | Liu C.-J.,Tianjin University | And 2 more authors.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2015

The reformed sulfolane extraction device of Hebei Xinqiyuan Energy Technology Development Co., Ltd. is featured by improving the production capacity of the original devices and reducing the unit energy consumption at the same time in the condition of the existing equipment of devices unchanged, with its feed changed from catalytic reforming products to the mixture of hydrogenated coking crude benzene and aromatization products. In order to adapt to the change of the feed, a circulation line for raffinate oil was added, and the extraction column, solvent-recovery column and benzene column were redesigned from plate columns to efficient packed columns and reduce energy consumption. After simulating the whole reformed process using PRO/II, the reliable data were obtained for the actual reformation. Finished on Oct. 30, 2013, the reformation process was put into operation. The data from actual running show that the production capacity of benzene after reformation is improved from 9 t/h to 13 t/h while the unit product consumption is reduced from 1.74 MW/t to 1.27 MW/t. The indexes of products all meet the design requirements, which prove that the PRO/II simulation is reliable. After reformation of the aromatic extraction, the production capacity is improved while the energy consumption is reduced, demonstrating that the reformation is a success. ©, 2015, Editorial Office of Chemical Engineering (China). All right reserved.


Geng Y.,Tianjin University | Qi W.-Z.,Tianjin University | Liu H.,Tianjin University | Liu C.-J.,Tianjin University | And 2 more authors.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2015

Domestic alkylation devices are mainly based on sulfuric acid method, of which waste acid is difficult to deal with. Producing ammonium sulfate with waste acid is a relatively mature process, while it still has many problems. To reduce energy consumption and improve efficiency, a novel process for producing ammonium sulfate with waste acid of alkylation was introduced. It used waste sulfuric acid and liquid ammonia as raw materials, separated the product from polymer oil with stripping flotation device, decolorized and deodorized the product in the activated carbon adsorption column, and crystallized ammonium sulfate in the evaporation crystallization system. In the process, ammonium sulfate was nearly saturated. Hot steam generated by neutralization reaction provided energy for the vaporization of ammonia and the crystallization of ammonium sulfate, realizing the energy integration. Ammonium sulfate product is white and relatively good, and the nitrogen mass fraction is 20.80%, which satisfies the market need. Process simulation software ASPEN was used to calculate the energy-saving effect. The result shows that 19000 tons of low-pressure steam is saved for a project with 20000 tons of waste acid to deal with per year. The average net income for dealing with 1 ton of waste acid is 400 Yuan, with remarkable economic benefit. © 2015, Editorial Office of Chemical Engineering (China). All right reserved.

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