关键词: MTBE, 硫含量, 胺液污染, 下界位控制, 除臭精制剂, 减压萃取蒸馏, 回收胺液, 废碱液

Abstract:

The sulfur content of MTBE products from a certain company often exceeds the standard. Through laboratory analysis of the fiber membrane fouling sample in the product refining unit, and a comparative analysis of the forms of MTBE and amine sulfur, it was ultimately determined that the main reason was amine contamination of the alkaline solution and high oil phase sulfur content in the amine solution. The following measures have been taken to address the above situation: the liquefied petroleum gas desulfurization tower has been transformed from upper limit control to lower limit control, increasing the static space for liquefied petroleum gas; In order to enhance the effect of mercaptan removal, GL deodorizing refining agent was used in the mercaptan removal system instead of sulfonated cobalt titanocyanine; The amine liquid regeneration is carried out using an amine liquid vacuum distillation purification unit, which can separate the oil from the amine liquid. By taking the above measures, the annual output of waste alkali in the product refining unit has decreased from 609.5 tons to 346.7 tons, and the annual cost of hazardous waste treatment has been reduced by 578 000 yuan; After reducing the treatment load of the amine regeneration unit, the steam consumption of the reboiler decreased by 1.5 t/h, and the annual steam consumption cost decreased by 2.106 million yuan; In addition, the sulfur mass fraction of MTBE products has been reduced from 55 μg/g to 45 μg/g, meeting the indicator requirements.

Key words: MTBE, sulfur content, amine contamination, lower limit control, deodorizing refining agent, vacuum extraction distillation, recycled amine solution, waste alkali