摘要:
The invention relates to a method for producing an olefin, a diene or a polyene, by catalytic conversion of at least one alcohol having a carbonated chain of at least three carbon atoms and different from propan-2-ol, in the presence of at least one catalyst based on the phosphate of a metal or a plurality of metals M, M being selected from the 15 lanthanides (lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium), yttrium, scandium and boron. The invention also relates to the applications of said method.
摘要:
The invention relates to a method for preparing acrolein from glycerol, according to which a dehydration of glycerol is carried out in the presence of a MWOA catalyst, MWO representing a mixture of simple oxides and/or of mixed oxides of tungsten and at least one metal M selected from zirconium, silicon, titanium, aluminum, and yttrium, and A represents one or more Lewis bases, one of said Lewis bases having the formula B(R1)p(R2)q(R3)r, B being an element selected from C, S, P, O, N, B and the halides, R1, R2 and R3 represent, independently of one another, H, a C1-C6 alkyl group, O, OH or OR, R representing a C1-C6 alkyl group, and the sum of p, q and r varies from 0 to 4.
摘要:
The invention relates to a process for the synthesis of a compound having the following formula (I), or a salt thereof, in which formula (I) R is a COOH, CH 2 OH or CHO group, comprising the step according to which but-3-ene-1,2-diol (BDO) is subjected to oxidation in the presence of a catalyst, said catalyst comprising an active phase based on at least one noble metal chosen from palladium, gold, silver, platinum, rhodium, osmium, ruthenium and iridium, and a support containing basic sites. The invention also relates to the application of this reaction to the preparation of bioavailable methionine compounds, in particular used in animal feed.
摘要:
The invention relates to a method for preparing a compound (I) or one of the salts thereof, and the uses of said method, R 1 OOC-C(=X)-CHR 2 R 3 (I), wherein X is selected among O; N-R', wherein R' is H or a C1-C6 alkyl; and N-OR'' wherein R'' is H, or a C1-C6 alkyl or an alkylaryl; R 1 is H or a C1-C6 alkyl group; R 2 is H, a C1-C6 alkyl, or an alkylaryl; and R 3 is CH 2 SR 4 or CH 2 SeR 4 , where R 4 is H or a C1-C6 alkyl from a compound (II), or one of the salts thereof, R 1 OOC-C(=X)-CHR 2 R 5 and R 5 is H or COOR 6 , where R 6 is H or a C1-C6 alkyl, said method being carried out in the presence of a compound (III) CH 2 (Y)(Z). Wherein Y is H; OR 7 , where R 7 is H, a C1-C6 alkyl or an acyl with formula CO-R 4 ; SR 4 or SeR 4 where R 4 matches the preceding definition; or 1 NR 8 R 9 , where R 8 and R 9 , identical or different, each or together are a C1-C6 alkyl, or an alkylaryl; Z, identical or different to Y, is OR 10 where R 10 is H, a C1-C6 alkyl or CO-R 4 ; a cyclic or acyclic N(COR 4 )(COR 4 ) group; or NR 11 R 12 , where R 11 and R 12 , identical or different, each or together are a C1-C6 alkyl or an alkylaryl; wherein Y and Z together are =O; said method involving an intermediate product (IV) R 1 OOC-C(=X)-CHR 2 -CH 2 Z.
摘要:
The invention relates to a continuous method for the purification of acrolein, wherein: an aqueous acrolein solution is supplied, devoid of gas which is difficult to condense, in a distillation column fitted with at least one boiler at the base thereof and with at least one condenser at the head thereof; a mixture which essentially contains water is drawn off at the base of the distillation column; a mixture which essentially contains acrolein and water is drawn off at the head of the distillation column; the mixture drawn off from the head of the distillation column is cooled in the condenser to a temperature enabling an aqueous condensate to be obtained, in addition to a substantial amount of a gaseous mixture which is rich in acrolein; the purified acrolein is isolated in the gaseous mixture which is rich in acrolein.