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    Vinyl acetate recovery - from mixts with methanol, methyl acetate and acetaldehyde by extractive distn
    2.
    发明专利
    Vinyl acetate recovery - from mixts with methanol, methyl acetate and acetaldehyde by extractive distn 未知

    公开(公告)号：DE2252276B1

    公开(公告)日：1974-01-31

    申请号：DE2252276

    申请日：1972-10-25

    Applicant: HOECHST AG

    Inventor： SCHMIDT A ,  FRIEDRICH G ,  HECK G

    IPC: C07C69/15 ,  C08F6/04 ,  C08F6/10 ,  C07C69/14

    Abstract: Recovery of vinyl acetate (I) from mixts. of (I) and MeOH contaminated with MeOAc and MeCHO by extractive distn. comprises : (a) separating the mixt., opt. also contg. H2O, into a top prod. of MeOH, MeOAc, MeCHO and small amts. of extractant (II) and (I) and a sump. prod. of (II) and (I), (II) being a benzene or naphthalene deriv. contg. only C and H, which is liq. at normal temp., boils above 100 degrees C and contains a polymerisation inhibitor (III), and (b) separating the sump prod. into (I) as top prod. and (II) as sump prod. (I) is obtd. in very pure form, which is esp. free from aldehydes and (III) and thus is suitable for the mfr. of high mol. polyvinyl acetate. Partic. suitable reagents are (II) 1,2,4-trimethylbenzene, (III) phenthizine.

    5.
    发明专利
    未知

    公开(公告)号：BR6906019D0

    公开(公告)日：1973-01-02

    申请号：BR20601969

    申请日：1969-01-30

    Applicant: HOECHST AG

    Inventor： KRAUSE W ,  SCHILKEN H ,  HECK G ,  MALOW E

    IPC: C07C7/11 ,  C10K1/16 ,  C07C11/24

    Abstract: 1,242,634. Separating carbon dioxide and acetylene from cracked gas. FARBWERKE HOECHST A.G. 30 Jan., 1969 [30 Jan., 1968], No. 5208/69. Heading B1L. Carbon dioxide and acetylene are separated from cracked gas streams which also contain other hydrocarbons, hydrogen, water and carbon monoxide by passing the stream by line 1 to acetone wash column 2 having a sump temperature of -10 to -50‹C. and a head temperature of -25 to -60‹C at 10-20 atmos. abs. Gaseous overhead leaves the process, while liquid sorbate passes by line 3 to fractional absorber-desorber 4 at 2-6 atmos. abs., the column having a sump temperature of -20 to 20‹C., and a fractionating column temperature of -20 to -60‹C, wherein the desorbed gases are washed with acetone supplied by line 5 until the desorbed gases contain 10-20 mol % CO 2 and the reabsorbed gases contain at most 0.2 mol % C 2 H 4 . The gaseous overhead from column 4 is returned to feed line 1, while the acetone solution bottoms are passed to desorber 6 and released to a pressure of 1-55 atmos, abs. and a temperature preferably of 105-115‹C. while at the same time being washed with anhydrous acetone which enters through line 17 and which removes water. Wet acetone bottoms containing hydrocarbons passes by line 15 for rectification in column 14. Gaseous overhead from desorber 6 passes by line 7 through drying towers 18 containing silica gel, activated carbon, or molecular sieves to wash column 8 where, at a pressure of 1.6-2 atmos. abs. and a head temperature of -15 to -25‹C. C 2 H 2 is absorbed in a wash stream of dimethyl formamide leaving an overhead of CO 2 . The sorbate passes by line 9 to column 10, where C 2 H 2 is stripped as the overhead, and the dimethyl formamide bottoms returned as wash liquid to column 8. In an alternative embodiment (see Fig. 2, not shown), the gaseous overhead from desorber 6 passes by line 7 to the base of dimethyl formamide absorber (11), bottoms therefrom passing to rectifying absorber (12), CO 2 being collected as the overheads from absorbers (11) and (12). Bottoms from absorber (12) pass to desorber (13) which releases an overhead of C 2 H 2 and a bottom product of dimethyl formamide which is returned to absorbers (11) and (12).

    7.
    发明专利
    未知

    公开(公告)号：BR7405622D0

    公开(公告)日：1975-05-13

    申请号：BR562274

    申请日：1974-07-08

    Applicant: HOECHST AG

    Inventor： HECK G ,  ROSCHER G ,  DONTH R

    IPC: C07C67/54 ,  B01D3/00 ,  B01D3/36 ,  C07C51/00 ,  C07C51/46 ,  C07C67/00

    Abstract: Water is separated by distillation from organic multiple component mixtures containing at least one component partly miscible with water. The component miscible with water is distilled azeotropically with the water contained in the mixture, the distillate is separated into water and a zeotrope forming agent and the latter is recycled to the distilling column. In the recycling process, one part of the azeotrope forming agent is conducted to the top of the column and the other part is fed into the column at the feed mixture inlet or at a location thereunder.

    10.
    发明专利
    未知

    公开(公告)号：BR7016010D0

    公开(公告)日：1973-01-18

    申请号：BR21601070

    申请日：1970-01-14

    Applicant: HOECHST AG

    Inventor： MALON E ,  HECK G ,  KRAUSE W ,  SCHILKEN H

    IPC: C07C7/11 ,  C07C11/24

    Abstract: 1,256,052. Separating carbon dioxide and acetylene from cracked gas. FARBWERKE HOECHST A.G. 15 Jan., 1970 [16 Jan., 1969], No. 1985/70. Addition to 1,242,634. Heading B1L. The rich dimethylformamide loaded principally with carbon dioxide and acetylene from used in the process of the Parent Specification, predegassed at 1.05-1.3 ats. abs. and 95- 110‹C.; 60-70% of the still partially charged product is returned directly for reuse, while the remaining 40-30% is completely degassed at 0.25-0.55 ats. abs. and 110-130‹C. before also being returned to the final wash stage of the process.

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