Scholarlink

<b>Abstract</b>— <p>Modified lignosulfonates have been investigated as a basis for polyfunctional sulfonic cation-exchange catalysts applicable in the chemical technology of basic organic and petrochemical synthesis. Using the example of the cyclotrimerization reaction of propanal, it has been demonstrated that the high catalytic activity is due to the polyfunctional nature of the catalyst. It has been established that the catalysts exhibit high thermal stability and retain their activity in aqueous-alcoholic media. In the reactions of isobutene hydration, tert-butyl alcohol dehydration, and the synthesis of alkyl tert-butyl ethers, lignosulfonate-based systems demonstrate competitiveness compared to traditional sulfo cation exchangers, combining high activity with enhanced stability. Based on the analysis of water distribution along the reactor height, a strategy for layered catalyst loading has been proposed, which allowed increasing the alcohol conversion from 70 to 83% and reducing the load on the rectification system. To extend the catalyst lifetime, an upgraded process flow scheme has been proposed, which includes a preliminary purification stage of the feedstock from transition metal ions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

New Lignosulfonate Catalysts in Chemistry and Technology: Synthesis and Application Prospects

  • 期刊论文

  • 发表日期：

    2025年12月1日

查看全文
  • O. Kh. Karimov,
  • E. Kh. Karimov,
  • V. R. Flid

摘要

Abstract—

Modified lignosulfonates have been investigated as a basis for polyfunctional sulfonic cation-exchange catalysts applicable in the chemical technology of basic organic and petrochemical synthesis. Using the example of the cyclotrimerization reaction of propanal, it has been demonstrated that the high catalytic activity is due to the polyfunctional nature of the catalyst. It has been established that the catalysts exhibit high thermal stability and retain their activity in aqueous-alcoholic media. In the reactions of isobutene hydration, tert-butyl alcohol dehydration, and the synthesis of alkyl tert-butyl ethers, lignosulfonate-based systems demonstrate competitiveness compared to traditional sulfo cation exchangers, combining high activity with enhanced stability. Based on the analysis of water distribution along the reactor height, a strategy for layered catalyst loading has been proposed, which allowed increasing the alcohol conversion from 70 to 83% and reducing the load on the rectification system. To extend the catalyst lifetime, an upgraded process flow scheme has been proposed, which includes a preliminary purification stage of the feedstock from transition metal ions.