公开(公告)号：DE3317497A1

公开(公告)日：1984-11-15

申请号：DE3317497

申请日：1983-05-13

Applicant: HOECHST AG

Inventor： KUXDORF BERNHARD DIPL ING ,  LUHR PETER DIPL ING ,  THUEMMLER URSUS DIPL CHEM DR ,  WERNER HUGO DIPL ING ,  KLEMM WALTER DIPL ING

IPC: F22B33/18 ,  C01B25/12 ,  C01B25/20 ,  F22D1/02 ,  C01B25/234 ,  F22B1/18

Abstract: The disclosure relates to a process for making phosphorus pentoxide by subjecting elemental yellow phosphorus to combustion with dried air inside a steel-made combustion chamber with utilization of the reaction heat for the production of energy. To this end, the disclosure provides for the combustion to be effected inside a combustion chamber of which the walls are arranged so as to form a cooling system with cavities therein; for water or a water/steam-mixture as a heat carrier abstracting the reaction heat to be circulated through the cooling system, the water or water/steam-mixture assuming an increased temperature being circulated, preferably under increased pressure; for steam formed in the cooling system to be continuously taken therefrom; for an equivalent proportion of fresh desalted water to be introduced into the cooling system; for hot gaseous phosphorus pentoxide issuing from the combustion chamber to be condensed or worked up into phosphoric acid; for the steam taken from the cooling system to be passed through a steam delivery pipe disposed in the upper portion of the combustion chamber, or through a delivery conduit for product gas containing phosphorus pentoxide; for the steam to be heated therein to a temperature of 400 DEG to 600 DEG C. under constant pressure, and for the steam so superheated to be used.

公开(公告)号：DE2903586A1

公开(公告)日：1980-08-14

申请号：DE2903586

申请日：1979-01-31

Applicant: HOECHST AG

Inventor： KAISER KARL DIPL CHEM DR ,  WILLMS ROBERT ,  KUXDORF BERNHARD DIPL ING

IPC: C08F6/00 ,  C08F6/06 ,  C08F6/10 ,  C08F10/00

Abstract: The invention relates to an improved process, wherein polyolefins are freed from saturated liquid residual hydrocarbons with the aid of water and steam. The improvement comprises A. introducing the hydrocarbon-containing polyolefin into an aqueous emulsifier-containing solution having a surface tension at 20 DEG C. of about 50 to 60 dynes/cm with respect to air; stirring the resulting mixture and converting it to a homogeneous dispersion, the aqueous dispersion containing about 10 to 40 weight % of the polyolefin; B. introducing the dispersion into the upper portion of a column provided with 5 to 30 sieve plates and overflow weirs and contacting the dispersion in countercurrent fashion with steam of about 100 DEG to 120 DEG C.

公开(公告)号：DE2718858A1

公开(公告)日：1978-11-02

申请号：DE2718858

申请日：1977-04-28

Applicant: HOECHST AG

Inventor： KUXDORF BERNHARD DIPL ING ,  WISSEL KURT DIPL ING DR ,  KAISER KARL DIPL CHEM DR

IPC: B01D3/16 ,  B01D3/22 ,  B01D3/32 ,  B01D19/00 ,  G01N1/10 ,  B01D3/24 ,  C08J11/00

Abstract: A degassing column has a several equally spaced plates that have perforations with a dia. 5 mm. There is a small gap between the edge of the plate and the inside of the column casing. These plates are supported around their circumference by several lugs fixed to the inner surface of the column. In addition there is a rectangular section ring (5 to 20 mm wide) welded to the inside surface of the column, that spans between the lugs. The ring sections end just short of the lugs to leave a free space between the end of the ring sections and the lugs. Passing through each plate are eccentrically positioned downcomer pipes, which extend down almost to the plate below. A metal disc, at least the dia. of the downcomer pipe, with no perforations, is placed immediately below the downcomer on the plate below. The height of downcomer extending above each plate sets the liq. level. The tops of the downcomers may be fitted with a sleeve to enable adjustment of the height above the plate. Used in degasification columns, e.g. to eliminate monomers from polymers. Design avoids solid deposits on the plates and column walls. Because the ring is welded to the column it does not have to be supported.

公开(公告)号：DE2718857A1

公开(公告)日：1978-11-02

申请号：DE2718857

申请日：1977-04-28

Applicant: HOECHST AG

Inventor： KUXDORF BERNHARD DIPL ING ,  WISSEL KURT DIPL ING DR ,  KAISER KARL DIPL CHEM DR

IPC: B01D3/22 ,  B01D19/00 ,  B01D3/24 ,  C08J11/00

Abstract: A degassing column has a several equally spaced plates that have perforations with a dia. 5 mm. There is a small gap between the edge of the plate and the inside of the column casing. These plates are supported around their circumference by several lugs fixed to the inner surface of the column. In addition there is a rectangular section ring (5 to 20 mm wide) welded to the inside surface of the column, that spans between the lugs. The ring sections end just short of the lugs to leave a free space between the end of the ring sections and the lugs. Passing through each plate are eccentrically positioned downcomer pipes, which extend down almost to the plate below. A metal disc, at least the dia. of the downcomer pipe, with no perforations, is placed immediately below the downcomer on the plate below. The height of downcomer extending above each plate sets the liq. level. The tops of the downcomers may be fitted with a sleeve to enable adjustment of the height above the plate. Used in degasification columns, e.g. to eliminate monomers from polymers. Design avoids solid deposits on the plates and column walls. Because the ring is welded to the column it does not have to be supported.

公开(公告)号：DE3137513A1

公开(公告)日：1983-04-07

申请号：DE3137513

申请日：1981-09-21

Applicant: HOECHST AG

Inventor： HUNDECK JOACHIM DIPL CHEM DR ,  SCHOLZ HARALD DIPL CHEM DR ,  HENNEN HANS ,  KUXDORF BERNHARD DIPL ING ,  PUESCHE HERBERT DIPL ING

IPC: B01J27/00 ,  C07B61/00 ,  C07C17/00 ,  C07C17/02 ,  C07C17/383 ,  C07C19/045 ,  C07C67/00

Abstract: The disclosure relates to a process for making 1,2-dichloroethane by reacting ethylene and chlorine in a reaction zone having a liquid medium containing chlorinated C2-hydrocarbons circulated therein. To this end, the disclosure provides: (a) for approximately equimolar proportions of ethylene and chlorine to be introduced into the circulated liquid medium; for the whole to be reacted in a reaction zone at a temperature of about 75 DEG up to 200 DEG C. under a pressure of about 1 up to 15 bars, the mean sojourn time of the reaction mixture in the mixing zone and reaction zone being equal to about 1 to 15 hours; (b) for a portion of liquid reaction mixture to be removed from the reaction zone and subdivided into two streams, for one of these streams to be passed through a heat exchanger for the abstraction of calorific energy and reduction of its initial temperature, and for it to be recycled to the mixing and reaction zone; for the second stream to be introduced into an expansion vessel and for proportions corresponding to the quantity of reaction product formed in the reaction zone to be evaporated therein; for resulting vaporous matter to be introduced into a fractionating column, unevaporated liquid matter of the second stream being recycled into the liquid medium circulated in the mixing and reaction zone; and (c) for 1,2-dichloroethane to be distillatively separated from the vaporous matter introduced into the fractionating column with the use of a portion of the heat energy transferred inside the heat exchanger and for the 1,2-dichloroethane to be removed overhead.

公开(公告)号：DE2913030A1

公开(公告)日：1980-10-16

申请号：DE2913030

申请日：1979-03-31

Applicant: HOECHST AG

Inventor： CZEKAY ARNO DIPL CHEM DR ,  HOELLER ERNST DIPL ING ,  KUXDORF BERNHARD DIPL ING ,  PUESCHE HERBERT DIPL ING ,  NEUSS HANS-WILHELM ,  SCHOLZ HARALD DIPL CHEM DR

IPC: C07C17/25 ,  C07C21/06 ,  C07C17/34

Abstract: In a process for recovering pyrolysis energy in the prodn. of vinyl chloride, liq. 1,2-dichloroethane (I) is preheated under pressure, vapourised and led in the gaseous state into a cleavage zone. After incomplete thermal cleavage the hot cleavage gases under pressure are cooled in a heat exchanger through which a heat transfer or cooling agent is passed. The heat exchange medium, after extracting heat from the hot gases, is led off for use in another part of the process. The cooled gas stream is treated in a number of successive distn. zones to recover HCl, vinyl chloride, unconverted (I) and high- and low-boiling components. Process allows utilisation of the pyrolysis heat evolved during cleavage of the (I), and which was previously lost. The heat is esp. used to heat the distn. columns in the prod. sepn. stage.

公开(公告)号：DE2913004A1

公开(公告)日：1980-10-16

申请号：DE2913004

申请日：1979-03-31

Applicant: HOECHST AG

Inventor： CZEKAY ARNO DIPL CHEM DR ,  HOELLER ERNST DIPL ING ,  KUXDORF BERNHARD DIPL ING ,  PUESCHE HERBERT DIPL ING ,  NEUSS HANS-WILHELM ,  SCHOLZ HARALD DIPL CHEM DR

IPC: C07C17/25 ,  C07C21/06 ,  C07C17/34

Abstract: In a process for recovering pyrolysis energy in the prodn. of vinyl chloride, liq. 1,2-dichloroethane (I) is preheated under pressure, vapourised and led in the gaseous state into a cleavage zone. After incomplete thermal cleavage the hot cleavage gases under pressure are cooled in a heat exchanger through which a heat transfer or cooling agent is passed. The heat exchange medium, after extracting heat from the hot gases, is led off for use in another part of the process. The cooled gas stream is treated in a number of successive distn. zones to recover HCl, vinyl chloride, unconverted (I) and high- and low-boiling components. Process allows utilisation of the pyrolysis heat evolved during cleavage of the (I), and which was previously lost. The heat is esp. used to heat the distn. columns in the prod. sepn. stage.

公开(公告)号：DE2907066A1

公开(公告)日：1980-09-04

申请号：DE2907066

申请日：1979-02-23

Applicant: HOECHST AG

Inventor： CZEKAY ARNO DIPL CHEM DR ,  HOELLER ERNST DIPL ING ,  KUXDORF BERNHARD DIPL ING ,  PUESCHE HERBERT DIPL ING ,  NEUSS HANS-WILHELM ,  SCHOLZ HARALD DIPL CHEM DR

IPC: C07C17/00 ,  C07C17/25 ,  C07C21/06 ,  C07C67/00 ,  C07C17/34

Abstract: In a process for recovering pyrolysis energy in the prodn. of vinyl chloride, liq. 1,2-dichloroethane (I) is preheated under pressure, vapourised and led in the gaseous state into a cleavage zone. After incomplete thermal cleavage the hot cleavage gases under pressure are cooled in a heat exchanger through which a heat transfer or cooling agent is passed. The heat exchange medium, after extracting heat from the hot gases, is led off for use in another part of the process. The cooled gas stream is treated in a number of successive distn. zones to recover HCl, vinyl chloride, unconverted (I) and high- and low-boiling components. Process allows utilisation of the pyrolysis heat evolved during cleavage of the (I), and which was previously lost. The heat is esp. used to heat the distn. columns in the prod. sepn. stage.

公开(公告)号：DE3024156A1

公开(公告)日：1982-01-21

申请号：DE3024156

申请日：1980-06-27

Applicant: HOECHST AG

Inventor： CZEKAY ARNO DIPL CHEM DR ,  HOELLER ERNST DIPL ING ,  KUXDORF BERNHARD DIPL ING ,  PUESCHE HERBERT DIPL ING ,  NEUSS HANS WILHELM

IPC: C07C17/383 ,  C07C21/06 ,  C07C17/34 ,  C07C17/38

Abstract: Vinyl chloride (I) recovery involes 2 stage distn. of a gas mixt. (II) obtd. by incomplete thermal cracking of CH2Cl.CH2Cl (III) at 8-40 bar and 450-650 deg. C in the absence of catalysts. (II) consists of (I), HCl, (III) and by-prods. It is partially condensed in a first distn. stage operating at 10-12 bar, to distil off the HCl, then (I) is distilled off in a second stage at 5-6.5 bar. The liquefied (I) obtd. at the top of the second stage, still contg. small amts. of HCl, is passed to the top of a degassing zone, where pt. of (I) contg. all the entrained HCl is vaporised in a circulating evaporator and returned to the first distn. stage, whilst very pure (I) is discharged at the bottom. The liquefied (I) obtd. at the top of the second distn. stage is pumped at 11-13 bar to the top of the degassing zone operating at this pressure and the (I) vapour contg. HCl obtd. at the top is released in gas form into the bottom of the first distn. stage, without intermediate condensation. The need to compress highly corrosive vapours from the degassing column is avoided.

公开(公告)号：DE2744002A1

公开(公告)日：1979-04-12

申请号：DE2744002

申请日：1977-09-30

Applicant: HOECHST AG

Inventor： KUXDORF BERNHARD DIPL ING ,  WISSEL KURT DIPL ING DR ,  KAISER KARL DIPL CHEM DR ,  WESSELMANN RUDOLF DIPL ING

IPC: F28D9/04

Abstract: Spiral heat exchanger has vertically arranged, spirally wound spaced walls defining two passages for a suspension and a cooling medium, respectively, the walls being disposed between two cover plates in which are arranged inlet and outlet openings for the cooling medium and suspension, respectively. Passages have a rectangular cross-section and the aspect ratio of the passage width to height may vary from 30 - 3:1. Suspension and cooling medium have an inlet and outlet, respectively, the inlet and outlet spigots being arranged tangentially w.r.t. the spiral heat exchanger. Cooling medium may be a suspension which is a dispersion of a polymer, e.g. a PVC, polymer may be a copolymer such as a vinyl chloride and vinyl acetate. Used as heat exchangers for suspensions containing particulate material. Blockages of heat exchanger are prevented.