Preparation of organic polysulfide polymers using heavy residues

Details Preparation of organic polysulfide polymers using heavy residues Preparation of organic polysulfide polymers using heavy residues

1977-05-10

1978-07-25

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From sulfur-containing reactant

260 336R, 260 338R, 260 37R, 427388R, 428450, C08G 7516

Patent

active

041028740

ABSTRACT:
In the abatement of a waste disposal problem in the manufacture of vinyl chloride wherein 1,2 dichloroethane is an intermediate and a heavy residue is recovered as still bottoms, from the purification by distillation of dichloroethane and/or vinyl chloride having an organic-origin chloride content ranging between 55 and 80% by weight, wherein said heavy residue is reacted at 50.degree. to 100.degree. C., in aqueous medium with an alkali metal or an alkaline earth metal polysulfide, the proportion of polysulfide being equal at least to 30% by weight of the molar theoretical quantity, the average sulfur rank of polysulfide being more than 1 and up to and including 5, the pH of the reaction medium not exceeding 10.5 when the reaction is completed, and the obtained precipitate is separated from the reaction mother liquor, said precipitate being organic polysulfide polymers containing 4-80% by weight of sulfur, the improvement of using intermediate steps prior to the separation of the precipitate from the mother liquor of:
(a) at the end of the reaction, adding an additional quantity of heavy residue amounting to 10-80% by weight of the quantity of the initially added heavy residue; and
(b) acidifying the reaction medium to coagulate the resultant polymer precipitate.

REFERENCES:
patent: 2466963 (1949-04-01), Patrick et al.
patent: 3111545 (1963-11-01), Nobis et al.
patent: 4025495 (1977-05-01), Peerts et al.

Affiliated with

Also associated with

Rating

Preparation of organic polysulfide polymers using heavy residues does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Preparation of organic polysulfide polymers using heavy residues, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preparation of organic polysulfide polymers using heavy residues will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1420474