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膜分离技术制备高纯单宁酸的研究 总被引:6,自引:0,他引:6
工业单宁酸经改性活性炭预处理后,用超滤和纳滤技术纯化的方法制备高纯度单宁酸。重点考察了料液质量分数、操作压力差、料液温度对膜分离效果的影响。确定的最佳工艺条件是:料液质量分数 15%、截留相对分子质量为 6000 的超滤膜和截留相对分子质量为600的纳滤膜的操作压力差分别为 0.10 MPa 和 0.08 MPa、料液温度 40℃。同时探讨了颗粒活性炭通过硝酸氧化改性增强其吸附性能的方法。分析结果表明,膜分离技术有效地实现了不同分子质量的物料分级和截留,精品单宁酸的含量为 97.3%,收率为 84.7%。 相似文献
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本文介绍了荆门石化总厂重整装置预加氢单元应用RS-1催化剂加工高氯,高氮原料油的工业应用情况;介绍了装置的开工及一年的工业运转情况。 相似文献
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Influences of polymer-based grinding aid (PGA) on the damage process of concrete exposed to sulfate attack under dry-wet cycles were investigated. The mass loss, dynamic modulus of elasticity (E rd), and S and Ca element contents of concrete specimens were measured. Scanning electron microscopy (SEM), mercury intrusion porosimetry(MIP), and X-ray diffractometry(XRD) were used to investigate the changing of microstructure of interior concrete. The results indicated that PGA was capable of reducing the mass loss and improving the sulfate attack resistance of concrete. X-ray fluorescence (XRF) analysis revealed that PGA delayed the transport process of sulfate ions and Ca ions. In addition, MIP analysis disclosed that the micropores of concrete with PGA increased in the fraction of 20–100 nm and decreased in the residues of 200 nm. Compared with the blank sample, concrete with PGA had more slender and well-organized hydration products, and no changes in hydration products ratio or type were observed. 相似文献
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二次转化降烯烃技术在生产新国标汽油中的应用 总被引:1,自引:1,他引:0
为解决80万t/a深度催化裂化(DCC)装置生产的汽油烯烃含量过高,无法调制出烯烃含量符合新国标要求的汽油问题,中国石化股份有限公司荆门分公司从2002年4月开始在工业装置上应用石油化工科学研究院汽油二次转化降烯烃技术。应用结果表明,回炼前,DCC汽油中烯烃的体积分数(荧光法)高达68.32%~75.12%;回炼后,汽油中烯烃的体积分数(荧光法)可降低到47.6%~50.6%。调和后,2003—2004年共生产新国标商品汽油160余万t。 相似文献
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