| 摘要: |
| 目的 对异丁烯选择性叠合技术进行优化和开发，形成一种生产高纯度二异丁烯的HD-DIM工艺。方法 ①将异丁烷和/或正丁烷等惰性组分掺混至异丁烯原料中；②将原料分为管程原料和壳程原料，前者在第一反应器管程发生叠合反应并放出热量，后者在壳程吸收该热量后气化，再被送至反应精馏塔；③采用与C4组分形成共沸的水及这些水与异丁烯水合生成的叔丁醇作为反应精馏塔反应段的复合抑制剂；④采用反应精馏塔侧线抽出的共沸物作为第一反应器、第二反应器的循环抑制剂。结果 ①惰性组分的加入稀释了叠合反应器进料中异丁烯含量，有效降低了反应强度和反应温升；②快速移除反应热，避免在反应器内出现“热点”，反应热全部用于反应精馏塔内轻、重组分的分离；③省去了常规流程向反应精馏塔反应段补充叔丁醇的管路及设施，降低了新鲜叔丁醇的耗量；④省去了用于将共沸物中叔丁醇和二异丁烯进行分离的设备，简化了流程。结论 HD-DIM工艺可生产质量分数≥99.9%的二异丁烯产品，可显著降低装置能耗，并可提高二异丁烯收率，减少催化剂装填量。 |
| 关键词: 高纯度二异丁烯 HD-DIM工艺 热点温度 共沸物 抑制剂 |
| DOI：10.3969/j.issn.1007-3426.2025.03.001 |
| 分类号: |
| 基金项目: |
|
| HD-DIM process for producing high-purity diisobutylene |
|
LIU Chengjun1, WEN Shichang1, LYU Xiaodong2, FENG Yinpeng2, ZHOU Xuan1
|
|
1.CNPC East-China Design Institute Co., Ltd., Qingdao, Shandong, China;2.Dandong Mingzhu Special Resin Co., Ltd., Dandong Liaoning, China
|
| Abstract: |
| Objective The aim is to optimize and develop the isobutene selective dimerization technology to form an HD-DIM process for the production of high-purity diisobutylene. Method Firstly, mixing inert components such as isobutane and/or n-butane into isobutene feed. Secondly, the feed was divided into tube side feed and shell side feed. The former underwent a dimerization reaction in the first reactor tube side and released heat, while the latter absorbed the heat in the shell side and was vaporized before being sent to the reaction distillation tower. Thirdly, using water that forms azeotropes with C4 components and tert butanol was generated by the hydration of this water with isobutene as a composite inhibitor for the reaction section of the reactive distillation tower. Fourthly, the azeotropes drawn off from the reactive distillation tower were used as the recycling inhibitor for the first reactor and second reactor. Result Firstly, the addition of inert components dilutes the content of isobutene in the feed of the dimerization reactor, effectively reducing the reaction intensity and temperature rise. Secondly, the heat of the reaction was quickly removed to avoid the occurrence of "hot spots" in the reactor, and all the heat of reaction was used for the separation of light and heavy components in the reaction distillation tower. Thirdly, the pipeline and facilities were saved for supplying tert-butanol to the reaction section of the reaction distillation tower in the conventional process, and the consumption of fresh tert-butanol was reduced. Fourthly, the equipment was saved for separating tert-butanol and diisobutylene in the azeotropes and the process was simplified. Conclusion The HD-DIM process can produce diisobutylene products with a mass fraction greater than or equal to 99.9%, significantly reduce unit energy consumption and increase diisobutylene yield while reducing catalyst loading. |
| Key words: high-purity diisobutylene HD-DIM process hot spot temperature azeotrope inhibitor |
