[EN] MACROMOLECULAR ANTIOXIDANTS BASED ON DUAL TYPE MOIETY PER MOLECULE: STRUCTURES METHODS OF MAKING AND USING THE SAME [FR] ANTIOXYDANTS MACROMOLÉCULAIRES BASÉS SUR DEUX TYPES DE FRACTIONS PAR MOLÉCULE : STRUCTURES, LEURS PROCÉDÉS DE FABRICATION ET D'UTILISATION
The present invention relates to a process for producing acrolein by liquid phase dehydration of glycerol by preparing a mixture of a catalyst suspended in an organic solvent comprising one or more vinyl polymers and glycerol; and then mixing and heating the mixture to between 150° C. and 350° C. to dehydrate the glycerol and form acrolein. The vinyl polymers are selected from the group consisting of polyolefins, polystyrene, and mixtures thereof. The polyolefins may be polyethylene, polypropylene, polybutylene, polyisobutylene, polyisoprene, polypentene, or mixtures thereof. The acrolein may be subjected to vapor phase oxidation in the presence of a catalyst, such as a mixed metal oxide, to produce acrylic acid.
Method for inhibiting polymerization of (meth)acrylic acid and its esters using an inhibitor and a process for making a compound useful as such an inhibitor
申请人:Bass Stephen
公开号:US20060074257A1
公开(公告)日:2006-04-06
This invention relates to a method for inhibiting polymerization of (meth)acrylic acid and its esters using a polymerization inhibitor which comprises at least one reduced halide-content azine dye-based compound. A process for producing reduced halide-content azine dye-based compounds using ion exchange resin technology is also provided.
POLYSULFIDE MIXTURE, METHOD FOR PRODUCING SAME, AND USE OF THE POLYSULFIDE MIXTURE IN RUBBER MIXTURES
申请人:LANXESS Deutschland GmbH
公开号:US20150274655A1
公开(公告)日:2015-10-01
The present invention relates to polysulfide mixtures comprising two or more compounds of the formula (I),
where the cations K
1
+
and K
2
+
mutually independently are any desired monovalent or are the nth part of an n-valent cation, and m is 0, 1, and/or 2, to a process for the production of these polysulfide mixtures, to the use of the polysulfide mixtures in rubber mixtures, to the rubber mixtures, to rubber vulcanizates produced therefrom, and to the use of these.
Process for the preparation of a-methylenelactones and a-substituted hydrocarbylidene lactones
申请人:——
公开号:US20020143195A1
公开(公告)日:2002-10-03
This invention pertains to a process for making &agr;-methylenelactones and &agr;-substituted hydrocarbylidene lactones. More specifically, the present invention obtains high yields of &agr;-methylene-&ggr;-butyrolactone by heating &ggr;-butyrolactone and diethyl oxalate in the presence of a base. The second step comprises treatment of the &agr;-oxalyl enolate salt with formaldehyde to afford the &agr;-methylene-&ggr;-butyrolactone.
The present invention relates to a method for prevention of premature polymerization during the preparation, purification, transportation and storage of a polymerizable compound with at least one conjugated unsaturated group in the presence of an azine dye-based compound as inhibitor. Further the present invention relates to methods of preparing such inhibitors as well as to the inhibitors itself, as well as to methods of improving solubility and stability of dissolved inhibitors.