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    Process for preparing precipitated silicas
    1.
    发明授权
    Process for preparing precipitated silicas 有权
    沉淀二氧化硅的制备方法

    公开(公告)号：US09550682B2

    公开(公告)日：2017-01-24

    申请号：US14367455

    申请日：2012-12-19

    Applicant: RHODIA OPERATIONS

    Inventor： Malika Clouin ,  Sylvaine Neveu

    IPC: C01B33/12 ,  C01B33/193

    CPC classification number: C01B33/128 ,  C01B33/193

    Abstract: A silica production method comprising reacting a silicate with at least one acid, in which the acid used in at least one of the steps of the production method is a concentrated acid, preferably selected from the group consisting of sulfuric acid having a concentration of at least 80% by weight, in particular at least 90% by weight, acetic acid having a concentration of at least 90% by weight, formic acid having a concentration of at least 90% by weight, nitric acid having a concentration of at least 60% by weight, phosphoric acid having a concentration of at least 75% by weight, and hydrochloric acid having a concentration of at least 30% by weight.

    Abstract translation: 一种二氧化硅生产方法，包括使硅酸盐与至少一种酸反应，其中在制备方法的至少一个步骤中使用的酸是浓酸，优选选自浓度至少为的硫酸 80重量％，特别是至少90重量％，浓度为至少90重量％的乙酸，浓度为至少90重量％的甲酸，浓度为至少60重量％的硝酸， 的浓度为至少75重量％的磷酸和浓度为至少30重量％的盐酸。

    PROCESS FOR PREPARING PRECIPITATED SILICA COMPRISING A MEMBRANE CONCENTRATION STEP
    2.
    发明申请
    PROCESS FOR PREPARING PRECIPITATED SILICA COMPRISING A MEMBRANE CONCENTRATION STEP 有权
    用于制备包含膜浓度步骤的预处理二氧化硅的方法

    公开(公告)号：US20150132209A1

    公开(公告)日：2015-05-14

    申请号：US14386012

    申请日：2013-03-21

    Applicant: RHODIA OPERATIONS

    Inventor： Sylvaine Neveu ,  Anne-Laure Pinault

    IPC: C01B33/12

    CPC classification number: C01B33/128 ,  C01B33/193

    Abstract: A process for preparing precipitated silica, in which a silicate is reacted with an acidifying agent in order to obtain a suspension of precipitated silica (S1), followed by: a separation step in order to obtain a cake, a cake-disintegration step in order to obtain a suspension of precipitated silica (S2), and a suspension drying step. According to the invention, a membrane concentration step is performed between the disintegration step and the drying step.

    Abstract translation: 制备沉淀二氧化硅的方法，其中硅酸盐与酸化剂反应以获得沉淀二氧化硅的悬浮液（S1），随后是：分离步骤以获得饼状，饼状分解步骤 得到沉淀二氧化硅（S2）的悬浮液和悬浮液干燥工序。 根据本发明，在分解步骤和干燥步骤之间进行膜浓缩步骤。

    Process for preparing precipitated silicas
    4.
    发明申请
    Process for preparing precipitated silicas 有权
    沉淀二氧化硅的制备方法

    公开(公告)号：US20150210555A1

    公开(公告)日：2015-07-30

    申请号：US14367425

    申请日：2012-12-19

    Applicant: RHODIA OPERATIONS

    Inventor： Malika Clouin ,  Sylvaine Neveu ,  Joël Racinoux

    IPC: C01B33/12

    CPC classification number: C01B33/128 ,  C01B33/193 ,  C01P2004/50

    Abstract: A process for preparing precipitated silica comprising a precipitation reaction between silicate and an acid, in which the acid used in at least one of the steps is a concentrated acid, preferably selected from the group consisting of sulfuric acid having a concentration of at least 80% by weight, in particular at least 90% by weight, acetic acid having a concentration of at least 90% by weight, formic acid having a concentration of at least 90% by weight, nitric acid having a concentration of at least 60% by weight, phosphoric acid having a concentration of at least 75% by weight, and hydrochloric acid having a concentration of at least 30% by weight.

    Abstract translation: 一种制备沉淀二氧化硅的方法，包括硅酸盐和酸之间的沉淀反应，其中在至少一个步骤中使用的酸是浓酸，优选选自浓度为至少80％的硫酸， ，特别是至少90重量％，浓度为至少90重量％的乙酸，浓度为至少90重量％的甲酸，浓度为至少60重量％的硝酸 ，浓度为至少75重量％的磷酸和浓度为至少30重量％的盐酸。

    Process for preparing precipitated silica
    6.
    发明授权
    Process for preparing precipitated silica 有权

    公开(公告)号：US09695054B2

    公开(公告)日：2017-07-04

    申请号：US14373797

    申请日：2013-01-23

    Applicant: RHODIA OPERATIONS

    Inventor： Emmanuelle Allain ,  Sylvaine Neveu

    IPC: C01B33/12 ,  C01B33/193

    CPC classification number: C01B33/128 ,  C01B33/193

    Abstract: A process for preparing precipitated silicas in which: (i) an aqueous stock with a pH of between 2 and 5 is formed; (ii) silicate and acid are simultaneously added to said stock, such that the pH of the resulting reaction medium is maintained between 2 and 5; (iii) silicate is added until a pH value of between 7 and 10 is obtained; (iv) silicate and acid are simultaneously added, such that the pH of the reaction medium is between 7 and 10; (v) acid is added until a pH value of between 2.5 and 5.3 is obtained; and (vi) the reaction medium is placed in contact with acid and silicate, such that the pH is between 2.5 and 5.3; wherein the acid used in at least one of the process steps is a concentrated acid.

    Process for preparing precipitated silica
    7.
    发明申请
    Process for preparing precipitated silica 有权
    沉淀二氧化硅的制备方法

    公开(公告)号：US20150266743A1

    公开(公告)日：2015-09-24

    申请号：US14373799

    申请日：2013-01-23

    Applicant: RHODIA OPERATIONS

    Inventor： Emmanuelle Allain ,  Sylvaine Neveu

    IPC: C01B33/12

    CPC classification number: C01B33/128 ,  C01B33/193

    Abstract: A process for preparing precipitated silica in which: (i) an aqueous stock having a concentration of alkali metal silicate less than 20 g/L is formed; (ii) acid is added to said initial stock, until at least 50% of the amount of M2O is neutralized; (iii) silicate and acid are simultaneously added, such that the degree of consolidation is greater than 4 and at most 100; (iv) silicate and acid are simultaneously added, such that the pH of the reaction medium is between 7 and 10; (v) acid is added until a pH value of between 2.5 and 5.3 is obtained; and (vi) the reaction medium is placed in contact with acid and silicate, such that the pH is between 2.5 and 5.3, wherein the acid used in at least one of the process steps is a concentrated acid.

    Abstract translation: 一种制备沉淀二氧化硅的方法，其中：（i）形成具有碱金属硅酸盐浓度低于20g / L的水性原料; （ii）将酸加入到所述初始原料中，直到M 2 O的至少50％被中和; （iii）同时加入硅酸盐和酸，使得固结度大于4并且至多为100; （iv）同时加入硅酸盐和酸，使得反应介质的pH为7至10; （v）加入酸直至获得2.5至5.3的pH值; 和（vi）将反应介质与酸和硅酸盐接触，使得pH在2.5和5.3之间，其中在至少一个工艺步骤中使用的酸是浓酸。

    Process for preparing precipitated silica comprising a high compaction step
    8.
    发明申请
    Process for preparing precipitated silica comprising a high compaction step 审中-公开
    包括高压实步骤的沉淀二氧化硅的制备方法

    公开(公告)号：US20150056120A1

    公开(公告)日：2015-02-26

    申请号：US14386015

    申请日：2013-03-21

    Applicant: RHODIA OPERATIONS

    Inventor： Sylvaine Neveu ,  Anne-Laure Pinault

    IPC: C01B33/12

    Abstract: A process for preparing precipitated silica comprising a reaction of a silicate with an acidifying agent to obtain a suspension of precipitated silica, followed by a step of separation to obtain a cake and a step of drying said cake, wherein a step of compaction of said cake at a pressure greater than 10 bars is carried out between the step of separation and the step of drying.

    Abstract translation: 一种制备沉淀二氧化硅的方法，其包括硅酸盐与酸化剂的反应以获得沉淀二氧化硅的悬浮液，然后分离步骤以获得滤饼和干燥所述滤饼的步骤，其中所述滤饼的压实步骤 在分离步骤和干燥步骤之间进行大于10巴的压力。

    Process for preparing precipitated silica having specific morphology, particle size and porosity
    9.
    发明申请
    Process for preparing precipitated silica having specific morphology, particle size and porosity 有权
    制备具有特定形态，粒度和孔隙率的沉淀二氧化硅的方法

    公开(公告)号：US20150030518A1

    公开(公告)日：2015-01-29

    申请号：US14373791

    申请日：2013-01-23

    Applicant: RHODIA OPERATIONS

    Inventor： Emmanuelle Allain ,  Sylvaine Neveu

    IPC: C01B33/12

    CPC classification number: C01B33/128 ,  C01B33/193

    Abstract: The invention relates to a process for the preparation of precipitated silica formed of aggregates of large primary silica particles, at the surface of which occur small primary silica particles, in which the acid used in at least one of the process steps is a concentrated acid.

    Abstract translation: 本发明涉及一种制备沉淀二氧化硅的方法，所述沉淀二氧化硅由大的一次二氧化硅颗粒的聚集体形成，其表面出现小的一次二氧化硅颗粒，其中至少一个工艺步骤中使用的酸是浓酸。

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