中文摘要：

国内的烷基化装置主要以硫酸法为主,但烷基化废酸较难处理,其中以废酸生产硫酸铵的工艺比较成熟,但存在诸多问题。为降低能耗,提高效率,文中介绍了一种烷基化废酸制备硫酸铵的新工艺方法。以废硫酸与液氨为原料,以气升式浮选装置进行反应产物与聚合油分离,使用活性碳吸附塔脱色脱臭,蒸发结晶系统进行结晶。工艺在硫酸铵近饱和条件下生产,使用中和反应生成的热蒸汽为液氨汽化及硫酸铵结晶工序提供热量,实现能量集成。工艺得到的硫酸铵产品颜色纯白,品相较好,氮质量分数达20.80%,满足市场要求。使用流程模拟软件ASPEN对节能效果进行模拟计算,2万t/a处理量的项目可节约低压蒸汽1.9万t/a。工艺平均每处理1 t废酸净收益400元,经济效益显著。

英文摘要：

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 19,000 tons of low-pressure steam is saved for a project with 20,000 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.