公开(公告)号：US20210387151A1

公开(公告)日：2021-12-16

申请号：US17295691

申请日：2019-12-03

Applicant: RHODIA OPERATIONS

Inventor： Rodolphe SAPEY-TRIOMPHE ,  Lars FISCHER ,  David VANZIN

IPC: B01J2/20

Abstract: The present invention relates to new lightly colored prills of hydroquinone. More particularly, the invention provides a new method for preparing said lightly colored prills of hydroquinone. The invention also relates to said prills of hydroquinone obtained by said new method.

公开(公告)号：US20200031749A1

公开(公告)日：2020-01-30

申请号：US16486427

申请日：2018-02-21

Applicant: RHODIA OPERATIONS

Inventor： Cédric HUMBLOT ,  David VANZIN ,  Lars FISCHER ,  Rodolphe SAPEY-TRIOMPHE

IPC: C07C37/70 ,  C07C39/08 ,  B01J2/20 ,  B01J2/02

Abstract: The invention relates to a novel solid form of diphenol compound. A process for the preparation of diphenol prills having a spherical shape is disclosed. Said process comprising providing a molten composition comprising from 50 to 100 wt. % of a diphenol compound or a mixture of at least two diphenol compounds, and less than 0.1 wt. % of water; forcing said molten composition through at least one droplet generator means to form droplets; and cooling said droplets to form solid diphenol prills. The diphenol prills obtainable by said process are also one subject-matter of the invention.

公开(公告)号：US20190023641A1

公开(公告)日：2019-01-24

申请号：US15757497

申请日：2015-09-07

Applicant: RHODIA OPERATIONS

Inventor： Christelle CHRETIEN ,  Karel VITS ,  Lars FISCHER ,  Yan SHI

IPC: C07C67/62

Abstract: The present invention relates to the use of at least two phenol derivatives jointly with at least one ancillary polymerization inhibitor which is different from these two phenol derivatives and particularly is selected from phenol derivatives, amine derivatives, thiazine derivatives, nitroso compounds, N-oxyl derivatives, metal salts, quinone derivatives, and mixtures thereof, to inhibit the polymerization of ethylenically unsaturated monomers comprising at least one heteroatom, it being also possible for a dispersant to be incorporated. The present invention also relates to a corresponding polymerization-inhibiting composition and to the corresponding process for preparing ethylenically unsaturated monomers comprising at least one heteroatom, and particularly acrylic monomers.

公开(公告)号：US20170275039A1

公开(公告)日：2017-09-28

申请号：US15512326

申请日：2015-09-15

Applicant: RHODIA OPERATIONS

Inventor： Lars FISCHER ,  Jacques CAVEZZAN ,  Jean-François THOME

IPC: B65B69/00 ,  C07C39/08

Abstract: A process for unloading a container containing an oxidizable compound having a melting point Tm greater than 15° C. is described. This process comprises the steps consisting in heating the container using a heating means until the oxidizable compound is liquid, the temperature of the heating means remaining less than or equal to Tm+105° C., and then unloading the oxidizable compound in the liquid state. A process for handling such an oxidizable compound, comprising this unloading step, and also a device enabling this process to be carried out, are also proposed.

公开(公告)号：US20160230089A1

公开(公告)日：2016-08-11

申请号：US15021994

申请日：2014-09-11

Applicant: RHODIA OPERATIONS

Inventor： Christelle CHRETIEN ,  Lars FISCHER ,  Stephan VERDIER ,  Jacques CAVEZZAN

IPC: C09K15/08 ,  C08F136/08

CPC classification number: C09K15/08 ,  C07C37/14 ,  C07C37/68 ,  C07C37/74 ,  C07C37/82 ,  C07C39/08 ,  C08F2/38 ,  C08F136/08 ,  C08F236/08 ,  C08F2/40

Abstract: The invention describes a composition that inhibits the polymerization of ethylenically unsaturated monomers, including at least 98% by weight of 4-tert-butylcatechol (4-TBC), 0.03% to 0.2% by weight of catechol (PC), and at least one impurity selected among 3-tert-butylcatechol, tert-butylhydroquinone, 3,5-di-tert-butylcatechol and mixture thereof, the total quantity of said impurities and of the PC being 0.1% to 0.8% by weight of said composition. The invention also describes a method for removing in said polymerization-inhibiting composition present in a mixture including at least one ethylenically unsaturated monomer.

Abstract translation: 本发明描述了抑制烯属不饱和单体聚合的组合物，包括至少98重量％的4-叔丁基邻苯二酚（4-TBC），0.03重量％至0.2重量％的儿茶酚（PC）和至少一种 选自3-叔丁基邻苯二酚，叔丁基氢醌，3,5-二叔丁基邻苯二酚及其混合物中的杂质，所述杂质和PC的总量为所述组合物重量的0.1％至0.8％。 本发明还描述了一种在包含至少一种烯属不饱和单体的混合物中存在于所述聚合抑制组合物中的方法。