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23 条记录 (耗时 0.022 秒)

    Process for the preparation of finely divided precipitated silica
    4.
    发明授权
    Process for the preparation of finely divided precipitated silica 有权
    制备细碎沉淀二氧化硅的方法

    公开(公告)号：US08252261B2

    公开(公告)日：2012-08-28

    申请号：US12112551

    申请日：2008-04-30

    申请人： Raksh Vir Jasra ,  Haresh Mahipatlal Mody ,  Rajesh Shantilal Somani ,  Hari Chand Bajaj ,  Dipak Balwantrai Shukla ,  Niraj Rameshchandra Vyas

    发明人： Raksh Vir Jasra ,  Haresh Mahipatlal Mody ,  Rajesh Shantilal Somani ,  Hari Chand Bajaj ,  Dipak Balwantrai Shukla ,  Niraj Rameshchandra Vyas

    IPC分类号： C01B33/12

    CPC分类号： C01B33/193

    摘要： The present invention provides a process for the preparation of finely divided precipitated silica. Finely divided precipitated silica is prepared by neutralization of alkali silicate solution, under continuous stirring, at 60° to 90° C. in presence of alkali metal salt as coagulating agent, in various neutralization steps during which neutralization is interrupted for specific time. Further acidic silica sol, is added until 60 to 80% of total alkali is neutralized. The reaction mixture is then aged at least for 3 minute under continuous agitation, followed by circulation through centrifugal pump at an appropriate rate.

    摘要翻译： 本发明提供了制备细碎沉淀二氧化硅的方法。 在连续搅拌下，在碱金属盐作为凝结剂的存在下，在碱性硅酸盐溶液中，在碱金属盐作为凝结剂的存在下，通过中和碱性硅酸盐溶液，在各种中和步骤中中和特定时间来制备精细分离的沉淀二氧化硅。 加入其它酸性二氧化硅溶胶，直到总碱的60〜80％被中和。 然后将反应混合物在连续搅拌下至少老化3分钟，然后以适当的速率循环通过离心泵。

    Green catalytic process for the synthesis of acetyl salicylic acid
    8.
    发明授权
    Green catalytic process for the synthesis of acetyl salicylic acid 有权
    用于合成乙酰水杨酸的绿色催化方法

    公开(公告)号：US07544831B2

    公开(公告)日：2009-06-09

    申请号：US11859001

    申请日：2007-09-21

    申请人： Raksh Vir Jasra ,  Beena Tyagi ,  Manish Kumar Mishra

    发明人： Raksh Vir Jasra ,  Beena Tyagi ,  Manish Kumar Mishra

    IPC分类号： C07C67/02 ,  C07C69/02 ,  C07C63/04

    CPC分类号： C07C67/08 ,  C07C69/157

    摘要： The present invention provides a green catalytic process for the synthesis of acetyl salicylic acid using solid acid catalysts at atmospheric pressure. The invention involve the solid acid catalyst such as sulfated transition metal oxides namely nano-crystalline sulfated zirconia, sulfated titania; modified zeolites namely zeolite H-beta, H-Y, H-ZSM-5 and K-10 montmorillonite clay in a solvent free environment using salicylic acid and acetic anhydride with yield about 95% and high selectivity (100%). The solid acid catalysts can be recovered, regenerated and reused.

    摘要翻译： 本发明提供了在大气压下使用固体酸催化剂合成乙酰基水杨酸的绿色催化方法。 本发明涉及固体酸催化剂，例如硫酸化过渡金属氧化物，即纳米结晶硫酸氧化锆，硫酸化二氧化钛; 改性沸石，即沸石H-β，H-Y，H-ZSM-5和K-10蒙脱土粘土，在无溶剂环境中使用水杨酸和乙酸酐，产率约95％，高选择性（100％）。 固体酸催化剂可以回收，再生和再利用。

    Process for the preparation of a molecular sieve adsorbent for the adsorptive dehydration of alcohols
    9.
    发明授权
    Process for the preparation of a molecular sieve adsorbent for the adsorptive dehydration of alcohols 有权
    用于制备用于醇的吸附脱水的分子筛吸附剂的方法

    公开(公告)号：US07407906B2

    公开(公告)日：2008-08-05

    申请号：US11297523

    申请日：2005-12-08

    申请人： Raksh Vir Jasra ,  Jince Sebastian ,  Chintansinh Dharmendrasinh Chudasama

    发明人： Raksh Vir Jasra ,  Jince Sebastian ,  Chintansinh Dharmendrasinh Chudasama

    IPC分类号： B01J20/18 ,  B01J29/06

    CPC分类号： B01J20/186

    摘要： This invention relates to the use of pore mouth control of microporous solids for developing novel molecular sieve adsorbents and their potential in the drying of alcohols. More specifically, the invention relates to the manufacture and use of a molecular sieve adsorbent, which selectively adsorbs water from azeotropic alcohol-water mixtures by pore mouth control of microporous solids with liquid phase metal alkoxide deposition on the external surface at ambient conditions of temperature and pressure. The prepared adsorbent is therefore useful for the commercial drying of alcohols.

    摘要翻译： 本发明涉及微孔固体的孔口控制用于开发新的分子筛吸附剂及其在醇的干燥中的潜力。 更具体地，本发明涉及分子筛吸附剂的制造和使用，其通过在环境温度条件下在外表面上的液相金属醇盐沉积孔微孔固体的孔口控制来选择性地吸附共沸醇 - 水混合物中的水，以及 压力。 因此，制备的吸附剂可用于醇的商业干燥。

    Catalytic epoxidation of styrene with molecular oxygen using metal ion exchanged zeolites
    10.
    发明申请
    Catalytic epoxidation of styrene with molecular oxygen using metal ion exchanged zeolites 有权
    使用金属离子交换的沸石用分子氧催化苯乙烯的环氧化

    公开(公告)号：US20070149791A1

    公开(公告)日：2007-06-28

    申请号：US11375697

    申请日：2006-03-14

    申请人： Raksh Vir Jasra ,  Jince Sebastian

    发明人： Raksh Vir Jasra ,  Jince Sebastian

    IPC分类号： C07D301/06

    CPC分类号： B01J29/072 ,  B01J29/143 ,  C07D301/06

    摘要： This invention provides a catalytic epoxidation of styrene to styrene oxide with molecular oxygen using cobalt containing zeolite. Catalytic epoxidation of styrene-to-styrene epoxide was carried out using molecular oxygen in presence of Co2+ exchanged zeolites. Molecular oxygen from air is also useful for the epoxidation reaction at atmospheric pressure. The presence of adsorbed water molecules in the catalyst also increases the styrene conversion without affecting the styrene oxide selectivity. Various alkali and alkaline earth cationic promoters were introduced into the zeolite catalyst to increase the styrene oxide selectivity. The present invention explore the effect of adsorbed water molecules and alkali and alkaline earth metal cationic promoters in the cobalt exchanged zeolite catalyst, on the styrene conversion and styrene oxide selectivity for the catalytic epoxidation of styrene to styrene oxide with molecular oxygen.

    摘要翻译： 本发明提供使用含钴沸石的苯乙烯与分子氧的氧化苯乙烯的催化环氧化。 苯乙烯 - 苯乙烯环氧化物的催化环氧化是在分子氧存在下进行的。 来自空气的分子氧也可用于在大气压下的环氧化反应。 催化剂中吸附水分子的存在也增加了苯乙烯转化率，而不影响氧化苯乙烯的选择性。 将各种碱金属和碱土金属阳离子促进剂引入到沸石催化剂中以增加氧化苯乙烯的选择性。 本发明探讨了吸附水分子和碱金属和碱土金属阳离子助催化剂在钴交换沸石催化剂中对苯乙烯转化率和苯乙烯氧化物选择性对苯乙烯与分子氧催化氧化苯乙烯氧化物的影响。