公开(公告)号：CA982130A

公开(公告)日：1976-01-20

申请号：CA188563

申请日：1973-12-19

Applicant: BASF AG

Inventor： FUCHS HARTWIG ,  SUTER HERBERT ,  BILLET REINHARD ,  GOELZ HORST ,  VON ERDEN KARL

IPC: C07D251/32 ,  C07C20060101

Abstract: A process for the production of cyanuric acid in which urea and an inert solvent are passed into a reaction zone in which pyrolysis of the urea with the formation of cyanuric acid takes place at 200 DEG to 300 DEG C, from 50 to 760 mm and a space-time yield of from 0.1 to 2 kg of cyanuric acid per liter of reaction volume per hour, and the cyanuric acid is separated in a crystal separation zone and freed from solvent in a falling film evaporator.

公开(公告)号：AU6376973A

公开(公告)日：1975-06-19

申请号：AU6376973

申请日：1973-12-19

Applicant: BASF AG

Inventor： SUTER HUBERT ,  ERDEN KARL VON ,  FUCHS HARTWIG ,  BILLET REINHARD ,  GOELZ HORST

IPC: C07D251/32 ,  C07C20060101 ,  C07D55/36

Abstract: A process for the production of cyanuric acid in which urea and an inert solvent are passed into a reaction zone in which pyrolysis of the urea with the formation of cyanuric acid takes place at 200 DEG to 300 DEG C, from 50 to 760 mm and a space-time yield of from 0.1 to 2 kg of cyanuric acid per liter of reaction volume per hour, and the cyanuric acid is separated in a crystal separation zone and freed from solvent in a falling film evaporator.

公开(公告)号：GB1020766A

公开(公告)日：1966-02-23

申请号：GB4707962

申请日：1962-12-13

Applicant: BASF AG

Inventor： BILLET REINHARD ,  HAEBERLE MANFRED ,  LAUTENSCHLAGER HANS ,  TRIESCHMANN HANS-GEORG

Abstract: Poly-(a -mono-olefines) are separated from solutions containing 1 to 20% by weight of the polyolefine dissolved therein by evaporating solvent from the solution at temperatures between 30 DEG and 240 DEG C. and pressures between 1.1 and 40 atmospheres until the solution contains 50 to 80% of polyolefine, then reducing the pressure to between 760 and 10 mm. of mercury, with or without increase in temperature, and removing the solvent thereby vaporized. Preferably, if the initial solution contains 1 to 15% of poly-(a -mono-olefine), the solvent is evaporated in two or more evaporators up to a poly-(a -mono-olefine) content of 50 to 80% by weight. In the first evaporator the solvent is preferably evaporated at temperatures of 10 DEG to 20 DEG C. above the solubility temperature of the poly-(a -mono-olefine) in the solvent used, and the boiling temperature in the second evaporator is preferably higher. The solvents used are linear or branched aliphatic, cycloaliphatic or aromatic hydrocarbons having boiling points at standard pressure of 35 DEG to 220 DEG C. such as pentane, hexane, heptane, octane, nonane, gasoline fractions, cyclohexane, benzene, toluene and xylene. A flow diagram is provided.