Jianguo Liu, Yizan Zuo, Minghan Han, Zhanwen Wang, Dezheng Wang
{"title":"提高Nieuwland催化剂在乙炔二聚制单炔乙炔过程中的稳定性","authors":"Jianguo Liu, Yizan Zuo, Minghan Han, Zhanwen Wang, Dezheng Wang","doi":"10.1016/S1003-9953(11)60396-4","DOIUrl":null,"url":null,"abstract":"<div><p>In the process of dimerization of acetylene to produce monovinylacetylene (MVA), the loss of active component CuCl in the Nieuwland catalyst due to the formation of a dark red precipitate was investigated. The formula of the precipitate was CuCl·2C<sub>2</sub>H<sub>2</sub>·1/5NH<sub>3</sub>, and it was presumed to be formed by the combination of NH<sub>3</sub>, C<sub>2</sub>H<sub>2</sub> and [Cu]-acetylene <em>p</em>-complex, which was an intermediate in the dimerization reaction. The addition of hydrochloric acid into the catalyst can reduce the formation of precipitate, whereas excessive H<sup>+</sup> is unfavorable to the dimerization reaction of acetylene. To balance between high acetylene conversion and low loss rate of CuCl, the optimum mass percentage of HCl in the added hydrochloric acid was determined. The result showed the optimum mass percentage of HCl decreased from 5.0% to 3.2% when the space velocity of acetylene was from 140 h<sup>−1</sup> to 360 h<sup>−1</sup>. The result in this work also indicated the pH of the Nieuwland catalyst should be kept in the range of 5.80–5.97 during the reaction process, which was good for both catalyst life and acetylene conversion.</p></div>","PeriodicalId":56116,"journal":{"name":"Journal of Natural Gas Chemistry","volume":"21 5","pages":"Pages 495-500"},"PeriodicalIF":0.0000,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60396-4","citationCount":"12","resultStr":"{\"title\":\"Stability improvement of the Nieuwland catalyst in the dimerization of acetylene to monovinylacetylene\",\"authors\":\"Jianguo Liu, Yizan Zuo, Minghan Han, Zhanwen Wang, Dezheng Wang\",\"doi\":\"10.1016/S1003-9953(11)60396-4\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In the process of dimerization of acetylene to produce monovinylacetylene (MVA), the loss of active component CuCl in the Nieuwland catalyst due to the formation of a dark red precipitate was investigated. The formula of the precipitate was CuCl·2C<sub>2</sub>H<sub>2</sub>·1/5NH<sub>3</sub>, and it was presumed to be formed by the combination of NH<sub>3</sub>, C<sub>2</sub>H<sub>2</sub> and [Cu]-acetylene <em>p</em>-complex, which was an intermediate in the dimerization reaction. The addition of hydrochloric acid into the catalyst can reduce the formation of precipitate, whereas excessive H<sup>+</sup> is unfavorable to the dimerization reaction of acetylene. To balance between high acetylene conversion and low loss rate of CuCl, the optimum mass percentage of HCl in the added hydrochloric acid was determined. The result showed the optimum mass percentage of HCl decreased from 5.0% to 3.2% when the space velocity of acetylene was from 140 h<sup>−1</sup> to 360 h<sup>−1</sup>. The result in this work also indicated the pH of the Nieuwland catalyst should be kept in the range of 5.80–5.97 during the reaction process, which was good for both catalyst life and acetylene conversion.</p></div>\",\"PeriodicalId\":56116,\"journal\":{\"name\":\"Journal of Natural Gas Chemistry\",\"volume\":\"21 5\",\"pages\":\"Pages 495-500\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2012-09-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/S1003-9953(11)60396-4\",\"citationCount\":\"12\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Natural Gas Chemistry\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1003995311603964\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Natural Gas Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1003995311603964","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Stability improvement of the Nieuwland catalyst in the dimerization of acetylene to monovinylacetylene
In the process of dimerization of acetylene to produce monovinylacetylene (MVA), the loss of active component CuCl in the Nieuwland catalyst due to the formation of a dark red precipitate was investigated. The formula of the precipitate was CuCl·2C2H2·1/5NH3, and it was presumed to be formed by the combination of NH3, C2H2 and [Cu]-acetylene p-complex, which was an intermediate in the dimerization reaction. The addition of hydrochloric acid into the catalyst can reduce the formation of precipitate, whereas excessive H+ is unfavorable to the dimerization reaction of acetylene. To balance between high acetylene conversion and low loss rate of CuCl, the optimum mass percentage of HCl in the added hydrochloric acid was determined. The result showed the optimum mass percentage of HCl decreased from 5.0% to 3.2% when the space velocity of acetylene was from 140 h−1 to 360 h−1. The result in this work also indicated the pH of the Nieuwland catalyst should be kept in the range of 5.80–5.97 during the reaction process, which was good for both catalyst life and acetylene conversion.