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对二甲苯生产技术再获突破

2017-09-05 08:31:59   中国青年网

本报讯(记者 郭晓斌)9月3日,记者从陕西煤化工技术工程中心获悉,由该中心开发的甲苯甲醇制对二甲苯联产低碳烯烃新技术、苯和甲醇选择性烷基化制对二甲苯技术,日前在北京双双通过中国石油和化学工业联合会组织的技术成果鉴定。鉴定认为,这两项技术工艺先进合理,指标处于国际领先水平,具有良好的应用前景。

由中国工程院院士袁晴棠任主任的鉴定委员会认为:陕西煤化工技术工程中心开发的甲苯甲醇制对二甲苯联产低碳烯烃新技术以及苯和甲醇选择性烷基化制对二甲苯技术,创造性地开发了催化剂低温再生工艺,技术工艺先进合理、对二甲苯单程收率高、原料来源广泛,既适用于煤化工领域,又可与炼化一体化装置耦合对接,为对二甲苯原料多元化开辟了先进、经济、可行的新路径。

对二甲苯是一种重要的有机化工原料,主要用于生产精对苯二甲酸(PTA)和对苯二甲酸二甲酯(DMT),而后再与乙二醇反应生成聚酯。随着我国经济快速发展,聚酯近年来在纺织服装、饮料包装等领域需求强劲。我国对二甲苯的需求自2012年后迅速增加,同时由于对二甲苯装置建设受限,我国对二甲苯自给率严重不足且逐年下降,2016年,我国对二甲苯自给率已经由2012年的50.14%降至43.32%,这一现象严重影响了对二甲苯及其下游产业的发展。

陕西煤化工技术工程中心是陕煤集团下属单位,专门致力于甲醇高附加值转化技术的开发,已经完成了多项国际领先技术开发。此次两项技术是研发团队在成功开发出性能良好的专用催化剂后,又经过反复的实验室工艺研究、百吨级中试验证和72小时现场考核后,通过鉴定的。现场结果显示:甲苯甲醇制对二甲苯联产低碳烯烃新技术,在保证较高对二甲苯选择性的前提下,甲苯单程转化率大幅度提升,甲苯单程质量转化率达51.77%,是原有一代技术的2倍多。与传统石油路线制对二甲苯技术相比,新技术工艺流程短、能耗低、原料来源广泛;与现有同类技术相比,新技术具有收率高、投资少、方案灵活、操作弹性大等优势。

国家发改委产业协调司石化处岳亚伟认为,这两项技术,既能充分利用我国焦化行业的大量副产品,就近生产对二甲苯;又能与石油路线对二甲苯技术嫁接,将低廉的甲醇引入炼化一体化项目作为生产对二甲苯的原料,增加产能,降低生产成本。无论对焦化行业转型升级,还是对提升石油路线对二甲苯项目竞争力,扩大我国对二甲苯规模,缓解需求矛盾都有重大现实意义。

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