Process for preparing by catalytic oxidation in oxygen-containing gas mixtures, acrolein from propylene and methacrolein
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C07C-045/35
C07C-045/38
출원번호
US-0390448
(1982-06-21)
우선권정보
DE-3125061 (1981-06-26)
발명자
/ 주소
Arntz Dietrich (Hanau DEX) Prescher Gnter (Hanau DEX) Heilos Johannes (Seligenstadt DEX)
출원인 / 주소
Degussa Aktiengesellschaft (Frankfurt am Main DEX 03)
인용정보
피인용 횟수 :
24인용 특허 :
0
초록▼
A process is disclosed for preparing acrolein from propylene and methacrolein from isobutylene or tertiary butanol, by oxidation in oxygen-containing gas mixtures on specially prepared coated catalysts comprised of an inert support and a coating, enclosing this support, of an oxidic catalyst materia
A process is disclosed for preparing acrolein from propylene and methacrolein from isobutylene or tertiary butanol, by oxidation in oxygen-containing gas mixtures on specially prepared coated catalysts comprised of an inert support and a coating, enclosing this support, of an oxidic catalyst material containing the elements nickel, cobalt, iron, bismuth, phosphorus, molybdenum and tantalum or samarium and, if appropriate, also alkali metal or alkaline earth metal in certain atomic ratios. This coated catalyst is obtained by spraying a suspension of the starting material for the coating, which suspension contains a binder and, if appropriate, a pore-former, from above in an increasing amount onto a bed of the support, which bed is mechanically agitated and loosened up by a gas stream blow in from below, the ratio between suspending medium sprayed on and removed again by the gas stream remaining approximately constant. The thermal expansion coefficient of the precursor as a dry powder must not deviate by more than 15% from the coefficient of the support. The coating is densified by further agitation, and the material is dried in the continuing gas stream and heat-treated, if appropriate after decomposition of an added pore-former.
대표청구항▼
In a process for preparing acrolein from propylene wherein there is carried out an oxidation in oxygen-containing gas mixtures in the presence of an active catalyst material of the composition: NiaCobFecBidPeMofOx in which a is a number from 2-20, b is a number from 0-15, a and b are a number from 2
In a process for preparing acrolein from propylene wherein there is carried out an oxidation in oxygen-containing gas mixtures in the presence of an active catalyst material of the composition: NiaCobFecBidPeMofOx in which a is a number from 2-20, b is a number from 0-15, a and b are a number from 2-20, c is a number from 0.1-7, d is a number from 0.1-4, e is a number from 0.1-4, f is about 12 and x is a number from 35-85, and 0.2 to 5% by weight of tantalum or samarium, calculated as Ta2O5 or Sm2O3, and a carrier therefor, said carrier being composed of a layer lattic silicate and/or highly dispersed silica, the weight ratio silicate to silica being 10:1 to 1:1, the improvement wherein an abrasion resistant coated catalyst is employed, said coated catalyst having an inert support which has a particle size of 0.5 to 6 mm and a rough surface and a coating enclosing said support and anchored in it, which coating is obtained by spraying a suspension of the starting material for the coating onto an agitated bed of the support while the suspending medium is partially removed by a gas stream at 20°-250°C. and an essentially constant residual moisture of the coating is being maintained, and drying and heat-treating, wherein coated catalysts are used for the oxidation in the preparation of which the support bed is set into mixing motion by mechanical agitation and is simultaneously loosened by blowing in from below a fluidizing, mixing-intensifying gas stream, and a suspension of a precursor of the catalytically active material, which suspension contains a binder, is passed countercurrent to the gas in this bed at a rate which increases with increasing thickness of the coating, the amounts of suspending medium drawn off and sprayed on being maintained in a substantially constant ratio which is determined by the particular combination of support and precursor used and the thermal expansion coefficients of support and of dried pulverulent precursor being so chosen that they differ by at most 15%, and wherein after the spraying-on has been completed the coating is densified by continuing the increased mixing motion, the mechanical mixing motion is then stopped, the material is dried in a continuing gas stream and finally heat-treated.
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