公开(公告)号：US09487407B2

公开(公告)日：2016-11-08

申请号：US14386069

申请日：2013-03-21

Applicant: RHODIA OPERATIONS

Inventor： Elise Fournier ,  Sylvaine Neveu ,  Joël Racinoux

IPC: C01B33/12 ,  C01B33/187 ,  C01B33/193

CPC classification number: C01B33/187 ,  C01B33/193

Abstract: A process for preparing precipitated silica comprising a reaction of a silicate with an acidifying agent to obtain a suspension of precipitated silica (S1), followed by a step of separation to obtain a cake, a step of spalling said cake to obtain a suspension of precipitated silica (S2) and a step of drying said suspension, wherein the spalling step is carried out at a temperature of between 50 and 120° C.

公开(公告)号：US20150266742A1

公开(公告)日：2015-09-24

申请号：US14367455

申请日：2012-12-19

Applicant: RHODIA OPERATIONS

Inventor： Malika Clouin ,  Sylvaine Neveu

IPC: C01B33/12

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。

公开(公告)号：US09108853B2

公开(公告)日：2015-08-18

申请号：US14386012

申请日：2013-03-21

Applicant: RHODIA OPERATIONS

Inventor： Sylvaine Neveu ,  Anne-Laure Pinault

IPC: C01B33/193 ,  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。

公开(公告)号：US20150110700A1

公开(公告)日：2015-04-23

申请号：US14386093

申请日：2013-03-21

Applicant: RHODIA OPERATIONS

Inventor： Sylvaine Neveu ,  Anne-Laure Pinault ,  Philippe Jost

IPC: C01B33/12

CPC classification number: C01B33/128 ,  C01B33/193

Abstract: A process for preparing precipitated silica comprising a reaction of a silicate with an acidifying agent to obtain a suspension of precipitated silica (S1), followed by a separation step to obtain a cake, a disintegration step of said cake to obtain a suspension of precipitated silica (S2), and a drying step of this suspension, wherein the disintegration step is performed by mixing using a twin-screw mixer or by extrusion.

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（S1），随后进行分离步骤以获得滤饼，所述滤饼的崩解步骤获得沉淀二氧化硅 （S2）和该悬浮液的干燥步骤，其中分解步骤通过使用双螺杆混合器或挤出进行混合来进行。

公开(公告)号：US10246338B2

公开(公告)日：2019-04-02

申请号：US14386093

申请日：2013-03-21

Applicant: RHODIA OPERATIONS

Inventor： Sylvaine Neveu ,  Anne-Laure Pinault ,  Philippe Jost

IPC: C01B33/12 ,  C01B33/193

Abstract: A process for preparing precipitated silica comprising a reaction of a silicate with an acidifying agent to obtain a suspension of precipitated silica (S1), followed by a separation step to obtain a cake, a disintegration step of said cake to obtain a suspension of precipitated silica (S2), and a drying step of this suspension, wherein the disintegration step is performed by mixing using a twin-screw mixer or by extrusion.

公开(公告)号：US10011494B2

公开(公告)日：2018-07-03

申请号：US14373799

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 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.

公开(公告)号：US09725325B2

公开(公告)日：2017-08-08

申请号：US14367425

申请日：2012-12-19

Applicant: RHODIA OPERATIONS

Inventor： Malika Clouin ,  Sylvaine Neveu ,  Joël Racinoux

IPC: C01B33/12 ,  C01B33/193

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.

公开(公告)号：US09695053B2

公开(公告)日：2017-07-04

申请号：US14373791

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: 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.

公开(公告)号：US20150078979A1

公开(公告)日：2015-03-19

申请号：US14386069

申请日：2013-03-21

Applicant: RHODIA OPERATIONS

Inventor： Elise Fournier ,  Sylvaine Neveu ,  Joël Racinoux

IPC: C01B33/187

CPC classification number: C01B33/187 ,  C01B33/193

Abstract: A process for preparing precipitated silica comprising a reaction of a silicate with an acidifying agent to obtain a suspension of precipitated silica (S1), followed by a step of separation to obtain a cake, a step of spalling said cake to obtain a suspension of precipitated silica (S2) and a step of drying said suspension, wherein the spalling step is carried out at a temperature of between 50 and 120° C.

Abstract translation: 一种制备沉淀二氧化硅的方法，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（S1），随后分离步骤以获得滤饼，剥离所述滤饼以获得沉淀的悬浮液 二氧化硅（S2）和干燥所述悬浮液的步骤，其中所述剥落步骤在50至120℃的温度下进行。

公开(公告)号：US20150037235A1

公开(公告)日：2015-02-05

申请号：US14373797

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 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.

Abstract translation: 一种制备沉淀二氧化硅的方法，其中：（i）形成pH为2至5的水性原料; （ii）将硅酸盐和酸同时加入到所述原料中，使得所得反应介质的pH保持在2和5之间; （iii）加入硅酸盐直到获得7至10的pH值; （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）使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。