摘要:
A process for producing alkyl ethers, by etherification of tertiary C4-7 olefins with an alkanol, comprising carrying out the etherification in reactor train system primarily configured for dimerization of isoolefins. In the etherification, the ratio of alkanol-to-olefin is 0.5 to 2, calculated from the amount of tertiary C4-7 olefins of the fresh feedstock. The invention makes it possible to change the product of the process from dimer to ether and vice versa merely by adjusting specific flows within the process. The present kind of process is therefore readily adaptable to fluctuating market demands for various gasoline octane-boosters (isooctane or MTBE).
摘要:
WOOD IS TREATED BY BEING INITIALLY IMPREGNATED WITH HYDRAZINE. THEREUPON WOOD IS SHAPED IN THE USUAL MANNER AND THEN EXCESS HYDRAZINE IS REMOVED. HYDRAZINE IS PREFERABLY USED IN AN AQUEOUS SOLUTION. WOOL MAY BE HEATED AFTER THE IMPREGNATION. THE PROCESS IS SUITABLE FOR TREATING WOOD VENEERS AND VARIOUS WOOD BOARDS.
摘要:
A process for producing a butene-1 polymer is disclosed which is characterized in that, in a process for producing a homopolymer of butene-1 or a copolymer of butene-1 and .alpha.-olefin other than the butene-1 in the presence a catalyst obtained from a solid catalyst component (A), an organic aluminium compound (B) and an electron donating compound (C) and under the condition of vapor phase polymerization, the solid catalyst component (A) is a non-layer solid catalyst component obtained by producing a carrier by chlorinating at least one kind of organic magnesium compounds represented by formulaMgR'R" (1)wherein R' and R", which may be the same or different, each represents an alkyl group having 1 to 20 carbon atoms, with at least one kind of chlorinating agents, the carrier produced is contacted in the presence of the electron donor with a titanic halide at a temperature of -25.degree. to +180.degree. C., and the electron donating compound (C) is a heterocyclic compound represented by ##STR1##
摘要:
Wood is softened by being impregnated with hydrazine. Thereupon, the wood may be shaped in the usual manner such as by heat and pressure and then excess hydrazine removed. Hydrazine is preferably used in an aqueous solution.
摘要:
The present invention relates to a method and apparatus for separating particulate matter from a gaseous stream. According to the method, the gaseous stream containing the suspended particulates is passed into a separator apparatus which includes at least two multiple-inlet-multicyclones (16-16C), wherein the particulates are separated from the gas by centrifugal force. According to the invention, a separator apparatus is employed wherein at least two (16-16C) of the multiple-inlet cyclones are adapted to operate in parallel so as to form a multiple-inlet-multicyclone apparatus. The cyclone assembly according to the invention may be used as, e.g., the primary separator of an FCC unit, but more advantageously it serves as the secondary or tertiary separator of an FCC unit to remove “fines” from the flue gases of the preceding separation stages.
摘要:
Partly acetylated regenerated cellulose films or fibers are manufactured by first swelling them in a concentrated and waterfree acetic acid solution of an alkali metal acetate at a temperature ranging between 50* and 140* C. Immediately thereafter and without drying the swelled films or fibers are esterified by an acetic acid anhydride solution containing alkali metal acetate at a temperature ranging between 100* and 170* C.