-
公开(公告)号：DE2606612A1
公开(公告)日：1977-08-25
申请号：DE2606612
申请日：1976-02-19
Applicant: BASF AG
Inventor： FINK PETER ING GRAD , WILD HANS DIPL CHEM DR , ZIZLSPERGER JOHANN DIPL CHEM D , REFFERT RUDI WILHELM ING GRAD , THIELEN GUNTER DIPL ING DR
Abstract: A process for removing vaporizable constituents from high-viscosity solutions or melts of thermoplastics by continuous evaporation along a heated devolatilization zone and separation of the vapor phase from the liquid phase in a downstream separating vessel. The plastic solution or melt is first heated stepwise in increments, in the devolatilization zone, while the product is in the form of thin layers from about 0.5 to 4 mm, so as to maintain a temperature difference of less than 50 DEG C. between the heat transfer medium and the plastic solution or melt until the devolatilization temperature is reached, the distribution of the solution or melt to form thin layers of product taking place while the temperature conditions still correspond to those of the feed of solution or melt, after which the vaporizable constituents are evaporated so as to form a two-phase system of vapor and melt, and the heat of evaporation absorbed is substantially returned to the product during the evaporation along the devolatilization zone. The process permits the removal of vaporizable constituents under mild conditions.
-
公开(公告)号：DE2539102A1
公开(公告)日：1977-03-17
申请号：DE2539102
申请日：1975-09-03
Applicant: BASF AG
Inventor： REFFERT RUDI WILHELM ING GRAD , WILD HANS DIPL CHEM DR , THIELEN GUNTER DIPL ING DR , ZIZLSPERGER JOHANN DIPL CHEM D , JECKEL GUENTER , ECHTE ADOLF DIPL CHEM DR
Abstract: Elimination is effected from a molten mass, soln. or dispersion by introducing the preheated material into the base part of a horizontal extruder under a pressure corresp., at the preheating temp., at least to the satn. pressure of the volatiles. The material is heated as it advanced through the extruder so that evapn. of the volatiles begins as the material enters the extruder, the major part of the volatiles leaving the extruder through an orifice situated vertically above the inlet orifice. The treated material is then extruded. Very rapid and efficient elimination of volatiles is obtd. The process is capable of treating the plastic materials at high flow rates. Material having a very low volatiles content, e.g. 0.1 wt. %, can be obtd.
-
Patent Agency Ranking
公开(公告)号：DE2743348A1
公开(公告)日：1979-04-05
申请号：DE2743348
申请日：1977-09-27
Applicant: BASF AG
Inventor： REFFERT RUDI WILHELM ING GRAD , GUENTHER WOLFGANG DIPL CHEM DR , WILD HANS DIPL CHEM DR , ZIZLSPERGER JOHANN DIPL CHEM D , ECHTE ADOLF DIPL CHEM DR
IPC: C08F212/10
Abstract: The monomers and opt. solvents and other polymerisation auxiliaries are charged continuously into a polymerisation zone and the liq. polymers are continuously discharged from the polymerisation zone. Volatile components are discharged from the gas compartment of the polymerisation zone, condensed and re-introduced into the polymerisation zone. Improvement comprises rinsing the surfaces defining the gas compartment of the polymerisation zone with the condensed constituents and opt. with the monomers to be charged to the polymerisation zone. Process can be used in styrene copolymerisation with (meth)acrylonitrile; in alpha-Me styrene and acrylonitrile copolymerisation and in styrene and acrylonitrile graft copolymerisation in the presence of elastomers. The formation of insoluble "popcorn" polymers on gas compartment walls is prevented.
-
公开(公告)号：DE2417792A1
公开(公告)日：1975-10-30
申请号：DE2417792
申请日：1974-04-11
Applicant: BASF AG
Inventor： WILD HANS DIPL CHEM DR , JECKEL GUENTHER , ECHTE ADOLF DIPL CHEM DR , ZIZLSPERGER JOHANN DIPL CHEM D , REFFERT RUDI WILHELM ING GRAD , THIELEN GUNTER DIPL ING DR
Abstract: Incorporation of (I) additives, e.g. fillers, plasticisers, pigments, stabilisers or lubricants, into (II) plastic matls. is affected with simultaneous elimination of volatile components, in a horizontal extruder for heating, mixing, transporting and extruding the mixt. by (a) initially introducing (I) into the extruder (1) in a downwards direction (4) in the advancement direction of the prod. (b) next introducing (II) as a molten mase, soln. or dispersion in an upwards direction (b), and (c) allowing the major part of the volatile components to escape from the extruder by an orifice (8) placed vertically above the feed orifice (b) for (II). Process combines efficient removal of volatiles with rapid mixing, transport and extrusion of the prod. with low heat/energy ratio.
-
公开(公告)号：DE2809180A1
公开(公告)日：1979-09-06
申请号：DE2809180
申请日：1978-03-03
Applicant: BASF AG
Inventor： GAUSEPOHL HERMANN DIPL CHEM DR , REFFERT RUDI WILHELM ING GRAD , WILD HANS DIPL CHEM DR , ECHTE ADOLF DIPL CHEM DR
IPC: C08F4/04 , C08F212/12 , C08F212/10
-
公开(公告)号：DE2555079A1
公开(公告)日：1977-06-23
申请号：DE2555079
申请日：1975-12-06
Applicant: BASF AG
-
公开(公告)号：DE2507061A1
公开(公告)日：1976-09-16
申请号：DE2507061
申请日：1975-02-19
Applicant: BASF AG
Inventor： WILD HANS DIPL CHEM DR , JECKEL GUENTER , ECHTE ADOLF DIPL CHEM DR , ZIZLSPERGER JOHANN DIPL CHEM D , REFFERT RUDI WILHELM ING GRAD , THIELEN GUNTER DIPL ING DR
Abstract: Incorporation of (I) additives, e.g. fillers, plasticisers, pigments, stabilisers or lubricants, into (II) plastic matls. is affected with simultaneous elimination of volatile components, in a horizontal extruder for heating, mixing, transporting and extruding the mixt. by (a) initially introducing (I) into the extruder (1) in a downwards direction (4) in the advancement direction of the prod. (b) next introducing (II) as a molten mase, soln. or dispersion in an upwards direction (b), and (c) allowing the major part of the volatile components to escape from the extruder by an orifice (8) placed vertically above the feed orifice (b) for (II). Process combines efficient removal of volatiles with rapid mixing, transport and extrusion of the prod. with low heat/energy ratio.
-
-
-
-
-
-
Search Results
7
records
(took 0.019 seconds)
