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    5.
    发明专利
    未知

    公开(公告)号：DE1904426A1

    公开(公告)日：1970-09-24

    申请号：DE1904426

    申请日：1969-01-30

    Applicant: HOECHST AG

    Inventor： KREKELER DR HANS ,  MEIDERT DR HELMUT ,  RIEMENSCHNEIDER DR WILHELM ,  HOERNIG DR LOTHAR

    IPC: C07C19/041 ,  C07C17/00 ,  C07C17/361 ,  C07C67/00 ,  C07C19/06

    Abstract: In the process for the manufacture of carbon tetrachloride from benzene, mixtures of benzene and chlorinated aliphatic or aromatic compounds, or chlorinated aromatic compounds, with chlorine in an excess amount of up to 300 percent, in the absence of catalysts in the gaseous phase in two reaction stages at a temperature in the first stage of from 6 DEG to 400 DEG C. and in the second stage of from 400 DEG to 800 DEG C. the space-time-yield is considerably increased by operating in both reaction stages under a pressure in the range of from 200 to 700 atmospheres. The reaction is carried out in a corrosion resistant reactor in continuous manner using 0.2 to 4 moles of organic compound or compounds per liter of reaction space per second.

    9.
    发明专利
    未知

    公开(公告)号：DE1200794B

    公开(公告)日：1965-09-16

    申请号：DEF0041549

    申请日：1963-12-14

    Applicant: HOECHST AG

    Inventor： RIEMENSCHNEIDER DR WILHELM ,  PROBST DR OTTO

    IPC: C07C47/04

    Abstract: In a process for the concentration of an aqueous formaldehyde solution by pressure distillation the water product discharged from the sump of the distillation column to sewerage is kept practically free from formaldehyde. The process involves bringing water to boil under a pressure of preferably 2 to 6 atmospheres in the sump, and then continually introducing the aqueous solution into the distillation column at between one quarters and four fifths of the way up the column, the solution being distilled off under this pressure at the head of the column and the vapours condensed, and the water product substantially free of formaldehyde being discharged from the sump, the water product containing a maximum of 0.2% by weight of formaldehyde. The concentration of the head product is increased by raising the reflux proportion. The basic aqueous solution introduced may include further constituents, such as methanol, formic acid, and methyl formate.

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