公开(公告)号：CA1138447A

公开(公告)日：1982-12-28

申请号：CA362458

申请日：1980-10-15

Applicant: SNIA VISCOSA

Inventor： ROSSI PIER P ,  CATONI MARIO

IPC: C07D201/16 ,  B01J19/18 ,  C07D201/08 ,  C07D201/10 ,  C07D223/10

Abstract: Process for the preparation of .omega.-lactams (in particular caprolactam) with improved yields, by reaction of cycloaliphatic derivatives having the general formula wherein n = 3 - 13 with nitrosating agents in the presence of the dehydrating agents, characterized by the fact that the reaction is carried out a low temperature which is constant between stages and in all the zones of a stage and with particular concentrations of the dehydrating agent.

公开(公告)号：CA1138892A

公开(公告)日：1983-01-04

申请号：CA330897

申请日：1979-06-29

Applicant: SNIA VISCOSA

Inventor： ROSSI PIER P ,  IACUONE ROBERTO ,  MAGNONI FRANCO

IPC: C07C51/34 ,  B01D53/14 ,  C07B31/00 ,  C07B41/08 ,  C07C51/00 ,  C07C51/42 ,  C07C67/00 ,  C07C53/00

Abstract: The invention is concerned with a process for separating and recovering organic compounds from oxygen-containing recycle gas deriving from the ozonisation of mono or polyunsaturated compounds, in the presence or absence of solvents. The gas before being recycled, is subjected to the following treatment: (a) passage through a suitable apparatus in which the products contained in the gas in the form of fumes are separated; (b) countercurrent scrubbing with a polyoxyalkyleneglycol having a molecular weight of 200 to 10,000 and pretreated with an anhydride of a monocarboxylic acid containing 2 to 4 carbon atoms; and/or (c) countercurrent scrubbing with a polyoxyalkyleneglycol having a molecular weight of 200 to about 10,000 or with an excess of a basic compound of an alkali metal in the form of an aqueous solution a Ph ? 8. The organic compounds absorbed during treatment (b) are then recovered by stripping at atmospheric pressure or under vacuum. If only treatment (c) with the polyoxyalkyleneglycol is carried out, the compounds are subsequently recovered either by stripping at atmospheric pressure or under vacuum, or by hydrolysis followed by distillation at atmospheric pressure or under vacuum. The process of the invention makes it possible to treat large quantities of gas with small quantities of scrubbing liquid, therefore attaining low stripping costs.

公开(公告)号：CA1132602A

公开(公告)日：1982-09-28

申请号：CA359962

申请日：1980-08-09

Applicant: SNIA VISCOSA

Inventor： ROSSI PIER P ,  ANASTASIO MAURIZIO

IPC: C07C69/33 ,  C07C69/75 ,  C10M105/32 ,  C10M105/38 ,  C10M111/02 ,  C10N30/02 ,  C10N40/28 ,  C10M1/26

Abstract: The present invention is directed to a new industrial product, characterized in that it is essentially constituted by alpha esters of (A) hexahydrobenzoic acid, and of other aliphatic or cycloaliphatic carboxylic acids, containing from 6 to 20 carbon atoms, and wherein the average amount in moles of the acid or acids different from hexahydrobenzoic acid which are present, with respect to 1 mole of said polyvalent alcohol, is comprised between 0 and 2, with(B) at least one polyvalent alcohol having the general formula (1) R-CH2OH (1) wherein R represents a radical chosen among (a) -C (Y)2-CH2-O-CH2C(Y)3; (b) -CH2-(O-CH2-CH2) -OH and/or(c) -¢cH(CH3)-OCH2!nCH(CH3)-OH optionally mixed with a different polyvalent alcohol having the general formula (2) R1-CH2-OH (2) wherein R1 represents a radical chosen among(d) -C(Y)2CH2CH3; (e) -CY(CH3)2; (f) -CH(CH3)OH; (g) -C(Y)3, wherein Y in formulae (1) and (2) represents a group-CH2OH and n is a whole number from 1 to 20.