公开(公告)号：US3886109A

公开(公告)日：1975-05-27

申请号：US36161973

申请日：1973-05-18

Applicant: STAMICARBON

Inventor： VAN HARDEVELD RUDOLF ,  VAN DER LOOS JOZEF L M

IPC: C08F6/00 ,  C08C1/00 ,  C08J3/07 ,  C08D5/00 ,  B01D12/00 ,  B01D17/04

CPC classification number: C08J3/07 ,  C08J2321/00

Abstract: A latex of a rubbery polymer material is produced from a solution of said polymer in an organic solvent by mixing the solution with water, evaporating the solvent, subjecting the obtained foamy product to the shear forces generated in a radial symmetrical space caused by injecting into the space, tangentially to the foam therein, a flow of gas or liquid. The treated foam includes the rubbery polymer, water, an organic solvent and at least one emulsifying agent. When subjected to shear forces, the foam breaks releasing the gaseous organic solvent which is removed from the obtained latex.

Abstract translation: 橡胶状聚合物材料的胶乳由所述聚合物在有机溶剂中的溶液通过将溶液与水混合，蒸发溶剂，使得到的泡沫产物在径向对称空间中产生的剪切力，由注入到 与其中的泡沫切向的空间，气体或液体的流动。 经处理的泡沫包括橡胶状聚合物，水，有机溶剂和至少一种乳化剂。 当受到剪切力时，泡沫破裂释放从所获得的胶乳中除去的气态有机溶剂。

公开(公告)号：DE3667802D1

公开(公告)日：1990-02-01

申请号：DE3667802

申请日：1986-09-08

Applicant: STAMICARBON

Inventor： ALFENAAR MARINUS ,  VAN DEN BRINK FRANCISCUS ,  VAN HARDEVELD RUDOLF

IPC: C07D213/79 ,  C07D213/803 ,  C25B3/23 ,  C25B3/02

Abstract: The invention relates to a process for the electrochemical oxidation of an alkylpyridine having the formula where R represents an alkyl group with 1-6 C atoms, and x is 1, 2 or 3, in an acid medium at a lead-containing anode of an electrolytic cell with anode and cathode compartments separated by an ion-exchange membrane, this process being characterized in that as an ion-exchange membrane an anion-exchange membrane is used and as catholyte an aqueous solution of the same acid as used in the anolyte, which solu­tion is dilute in respect of this anolyte, and subsequently the reac­tion product is recovered from the anolyte.

公开(公告)号：HU184277B

公开(公告)日：1984-07-30

申请号：HU106580

申请日：1980-04-29

Applicant: STAMICARBON

Inventor： VAN HARDEVELD RUDOLF

IPC: C07D251/60 ,  C07D251/56

公开(公告)号：PL241365A1

公开(公告)日：1983-11-21

申请号：PL24136583

申请日：1983-04-06

Applicant: STAMICARBON

Inventor： VAN HARDEVELD RUDOLF

IPC: C07D251/10 ,  C07D251/56 ,  C07D251/60 ,  C07D

Abstract: An improved process for the preparation of melamine from urea or thermal decomposition products thereof. A melamine containing reaction mixture is cooled with an aqueous medium to form an aqueous product stream containing melamine and reaction by-products. Product melamine is separated from the aqueous product stream leaving a residual aqueous stream which is recycled into the process. A portion of this residual aqueous stream still containing reaction by-product is treated to remove by-products therefrom prior to being recycled to the process.

公开(公告)号：PL223964A1

公开(公告)日：1981-02-13

申请号：PL22395980

申请日：1980-05-02

Applicant: STAMICARBON

Inventor： VAN HARDEVELD RUDOLF

IPC: C07D251/60 ,  C07D

公开(公告)号：DE3567846D1

公开(公告)日：1989-03-02

申请号：DE3567846

申请日：1985-03-05

Applicant: STAMICARBON

Inventor： VAN HARDEVELD RUDOLF ,  VAN DE MOND THEODORUS JOHANNES ,  VANDENBOOREN FRANCISCUS HENRIC

IPC: B01J35/10 ,  C01C3/16

Abstract: An improved process for the preparation of cyanamide or a cyanamide-containing gas mixture by passing urea and/ or urea decomposition products over a catalyst at a temperature in the range of between about 200°C and 600°C. A porous catalyst is utilized which has an intracrystalline pore diameter of at most 8 A, whereby a high conversion to cyanamide is obtained and the formation of melamine by-products is substantially reduced.

公开(公告)号：AT40343T

公开(公告)日：1989-02-15

申请号：AT85200320

申请日：1985-03-05

Applicant: STAMICARBON

Inventor： VAN HARDEVELD RUDOLF ,  VAN DE MOND THEODORUS JOHANNES ,  VANDENBOOREN FRANCISCUS HENRIC

IPC: B01J35/10 ,  C01C3/16

Abstract: An improved process for the preparation of cyanamide or a cyanamide-containing gas mixture by passing urea and/ or urea decomposition products over a catalyst at a temperature in the range of between about 200°C and 600°C. A porous catalyst is utilized which has an intracrystalline pore diameter of at most 8 A, whereby a high conversion to cyanamide is obtained and the formation of melamine by-products is substantially reduced.

公开(公告)号：HU184276B

公开(公告)日：1984-07-30

申请号：HU106480

申请日：1980-04-29

Applicant: STAMICARBON

Inventor： VAN HARDEVELD RUDOLF ,  MOREAU DOMINIQUE J J S M ,  BRULS PIERRE G M B ,  VAN HINSBERG JOHANNES G

IPC: C07D251/60 ,  C07D251/56

Abstract: An improved method for the preparation of melamine by the conversion of urea and/or thermal decomposition products thereof. The urea and/or thermal decomposition products are converted to melamine in the presence of a gas mixture containing ammonia and carbon dioxide in a reaction zone containing a fluidized bed of catalytically active material. Melamine is desublimated from the melamine containing gas mixture in a desublimation zone by a dry-capture method leaving a desublimator off-gas mixture of ammonia, carbon dioxide and gaseous impurities. A major portion of this desublimator off-gas mixture is compressed and recirculated to the reaction zone as fluidizing gas for the bed of catalytically active material, without intervening treatment to remove gaseous impurities from the desublimator off-gas.

公开(公告)号：CA1128515A

公开(公告)日：1982-07-27

申请号：CA351210

申请日：1980-05-09

Applicant: STAMICARBON

Inventor： VAN HARDEVELD RUDOLF ,  MOREAU DOMINIQUE J J S M ,  BRULS PIERRE G M B ,  VAN HINSBERG JOHANNES G

IPC: C07D251/60

Abstract: METHOD FOR THE PREPARATION OF MELAMINE An improved method for the preparation of melamine by the conversion of urea and/or thermal decomposition products thereof. The urea and/or thermal decomposition products are converted to melamine in the presence of a gas mixture containing ammonia and carbon dioxide in a reaction zone containing a fluidized bed of catalytically active material. Melamine is desublimated from the melamine containing gas mixture in a desublimation zone by a dry-capture method leaving a desublimator off-gas mixture of ammonia, carbon dioxide and gaseous impurities. A major portion of this desublimator off-gas mixture is compressed and recirculated to the reaction zone as fluidizing gas for the bed of catalytically active material, without intervening treatment to remove gaseous impurities from the desublimator off-gas.

公开(公告)号：HU178727B

公开(公告)日：1982-06-28

申请号：HUSA003022

申请日：1977-03-25

Applicant: STAMICARBON

Inventor： VAN HARDEVELD RUDOLF ,  HENDRIKS PETRUS F A M

IPC: C07D251/60 ,  B05B7/00 ,  B05B7/04 ,  B05B7/06 ,  B05B7/08 ,  B65G69/06

Abstract: Procedure for spraying a liquid by means of a gas or a mixture of gases in a two-phase sprayer consisting of a tube for the liquid with an outlet hole perpendicular to the direction of circulation and around this tube a coaxial tube for supplying the gas and which extends beyond the end of the tube for liquid and in which the gas stream surrounds and atomizes the outgoing liquid characterized in that the liquid is supplied with an exit velocity between 10 and 200 cm/second and the gas is supplied as a non-turbulent or barely turbulent current with unchanged or increasing velocity so that the gas stream is passed through a conicorode channel to the outgoing liquid stream while the angle between the directions of the gas stream and the liquid stream it is between 70º and 90º. (Machine-translation by Google Translate, not legally binding)