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    Process for the preparation of finely divided precipitated silica
    1.
    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。

    PROCESS FOR THE PREPARATION OF FINELY DIVIDED PRECIPITATED SILICA
    2.
    发明申请
    PROCESS FOR THE PREPARATION OF FINELY DIVIDED PRECIPITATED SILICA 有权
    制备精细分解的二氧化硅的方法

    公开(公告)号：US20090010832A1

    公开(公告)日：2009-01-08

    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。

    Process For Simultaneous Production Of Potassium Sulphate, Ammonium Sulfate, Magnesium Hydroxide And/Or Magnesium Oxide From Kainite Mixed Salt And Ammonia
    10.
    发明申请
    Process For Simultaneous Production Of Potassium Sulphate, Ammonium Sulfate, Magnesium Hydroxide And/Or Magnesium Oxide From Kainite Mixed Salt And Ammonia 有权
    同时生产硫酸钾，硫酸铵，氢氧化镁和/或氧化镁的方法，由凯氏混合盐和氨

    公开(公告)号：US20130315805A1

    公开(公告)日：2013-11-28

    申请号：US13981957

    申请日：2010-03-29

    申请人： Pushpito Kumar Ghosh ,  Haresh Mahipatlal Mody ,  Jatin Rameshchandra Chunawala ,  Maheshkumar Ramniklal Gandhi ,  Hari Chand Bajaj ,  Pratyush Maiti ,  Himanshu Labhshanker Joshi ,  Hasina Hajibhai Deraiya ,  Upendra Padmakant Saraiya

    发明人： Pushpito Kumar Ghosh ,  Haresh Mahipatlal Mody ,  Jatin Rameshchandra Chunawala ,  Maheshkumar Ramniklal Gandhi ,  Hari Chand Bajaj ,  Pratyush Maiti ,  Himanshu Labhshanker Joshi ,  Hasina Hajibhai Deraiya ,  Upendra Padmakant Saraiya

    IPC分类号： C01C1/24 ,  C01D5/00 ,  C01F5/08

    CPC分类号： C01C1/24 ,  C01D5/00 ,  C01D5/06 ,  C01F5/08 ,  C01F5/14 ,  Y02P20/125

    摘要： The present invention provides an integrated process for the recovery of sulphate of potash (SOP), ammonium sulphate and surface modified magnesium hydroxide and/or magnesium oxide utilizing kainite mixed salt and ammonia as the only consumable raw materials. The process involves treating kainite mixed salt with water to obtain solid schoenite and a schoenite end liquor. The latter is desulphated using CaCl2 generated in the process itself and thereafter evaporated to obtain carnallite crystals from which KCl is recovered while the liquor rich in MgCl2 serves as a source of MgCL. The gypsum produced during desulphatation is reacted with aqueous ammonia and CO2 to produce ammonium sulphate and calcium carbonate. The calcium carbonate so obtained is then calcined to obtained CaO and CO2. The CaO is then slaked in decarbonated water and reacted with the MgCl2-rich liquor generated above to produce slurry of Mg(OH)2 in aqueous CaCl2. To this surface modifying agent is added under hot condition and, after cooling, the slurry is more easily filterable and yields surface modified Mg(OH)2. The filtrate rich in CaCl2 is then recycled for desulphatation process above. The solid surface modified Mg(OH)2 is then calcined to produced MgO or used as such in appropriate applications. The schoenite and KCl are reacted to produce SOP in solid form while the liquor is recycled in the schoenite production step.

    摘要翻译： 本发明提供了一种用于回收硫酸钾（SOP），硫酸铵和表面改性氢氧化镁和/或氧化镁的综合方法，其使用赤铁矿混合盐和氨作为唯一的可消耗的原料。 该方法包括用水处理海藻酸盐混合盐，得到固体长丝云母和硫铁矿末端液。 后者使用在本方法中产生的CaCl 2进行脱硫，然后蒸发，得到回收KCl的光卤石晶体，富含MgCl 2的液体作为MgCl源。 在脱硫过程中产生的石膏与氨水和二氧化碳反应产生硫酸铵和碳酸钙。 然后将如此获得的碳酸钙煅烧以获得CaO和CO 2。 然后将CaO在脱碳酸水中溶解并与上述产生的富含MgCl 2的液体反应以在CaCl 2水溶液中产生Mg（OH）2的浆液。 在热条件下加入该表面改性剂，冷却后，浆料更易于过滤，得到表面改性的Mg（OH）2。 然后将富含CaCl2的滤液再循环用于上述脱硫过程。 然后将固体表面改性的Mg（OH）2煅烧生产MgO或在适当的应用中使用。 使白铁矿和KCl反应生成固体形式的SOP，同时在白铁矿生产步骤中回收液体。