摘要:
The aromatic hydrocarbons rich in benzene, toluene and xylene are prepared from a hydrocarbon feed having from 6 to 12 carbon atoms by feeding the hydrogen in admixture with hydrogen in a ratio ranging from 0 to less than 1 mole with respect to each mole of the hydrocarbon, into contact with a catalyst prepared by depositing at least one metal belonging to group VIII of the periodic table on a macroporous zeolite treated with a halogenated compound. The aromatic hydrocarbons rich in benzene, toluene and xylene are useful as a base for high octane number gasoline or as petrochemical raw materials.
摘要:
A method of culturing an amino acid racemaseproducing microorganism of the genus Pseudomonas, which comprising culturing said microorganism in a culture medium containing at least one compound selected from the group consisting of glycerol, ethanol, tartaric acid, fumaric acid and succinic acid as a carbon source, and recovering microorganism cells containing the amino acid racemase in an increased amount.
摘要:
A process for producing modified crystalline galloalumino silicate having the ZSM-5 crystal structure, and a process for producing aromatic hydrocarbons by the use of a catalyst containing the above modified crystalline galloalumino silicate are disclosed. The modified crystalline galloalumino silicate having the ZSM-5 type crystal structure is produced by calcining galloalumino silicate having the ZSM-5 type crystal structure as obtained by the hydrothermic reaction, at a temperature of 700 to 1,000.degree. C. The aromatic hydrocarbons are produced by contacting hydrocarbons having 2 to 12 carbon atoms with a catalyst containing the above modified crystalline galloalumino silicate.
摘要:
A process for cultivating a microorganism transformed with a recombinant plasmid at least containing (a) a DNA fragment containing a promoter and a regulator gene tnaC located downstream of the promoter in a tryptophanase operon (tna), and (b) a DNA fragment containing a desired structural gene which can be expressed by the promoter, which comprises cultivating the transformed microorganism in a culture medium while adding glucose as a carbon source continuously or intermittently so that the concentration of glucose is maintained within the range of 0.01 to 0.3%, and thereby allowing the desired structural gene to be expressed in the microorganism.
摘要:
There is disclosed a process for preparing glycol aldehyde from ethylene glycol by use of a complex system catalyst comprising copper and other inorganic component, which comprises permitting 0.001 to 0.3 mole of oxygen per one mole of ethylene glycol to be copresent in the reaction system.
摘要:
A process for producing aromatic hydrocarbons in a high yield by introducing a naphtha fraction the cyclopentane content of which is controlled to not more than 1% by weight, or the methylpentane content is controlled to not more than 10% by weight, in a catalytic reaction tower, and contacting with a catalyst comprising a large pore zeolite containing at least one of Group VII metals of the Periodic Table. In this process, the catalyst cycle is greatly lengthened.
摘要:
A method of selectively inhibiting pyruvic acid decomposition activity in microorganism cells containing tryptophanase or a treated product thereof, which comprises heat-treating said cells or the treated product thereof in the presence of an ammonium ion.
摘要:
The catalyst is an L-type zeolite with platinum supported thereon, which is then treated with a halogen-containing compound. The catalyst has a long catalyst life and is extremely useful for the preparation of aromatic hydrocarbons from aliphatic hydrocarbons. The process using the catalyst provides a production of aromatic hydrocarbons with a high yield.
摘要:
A solid strong acid catalyst useful for hydrocarbon reactions, especially for the skeletal isomerization of paraffinic hydrocarbons is provided by supporting sulfate (SO.sub.4) and at least one member selected from Group VIII metals on a support consisting of hydroxides and oxides of Group IV metals and Group III metals and mixtures thereof and then calcining and stabilizing the catalyst.
摘要:
A high-octane gasoline is produced by the conversion of a light hydrocarbon containing C.sub.2 -C.sub.7 paraffins and/or C.sub.2 -C.sub.7 olefins using a crystalline aluminogallosilicate catalyst of the formula:aM.sub.2/n O bAl.sub.2 O.sub.3 Ga.sub.2 O.sub.3 cSiO.sub.2 dH.sub.2 Owherein M is a metal selected from an alkali metal, an alkaline earth metal and a mixture thereof, n is the valence of said metal, a is a positive number of (b+1).+-.3.0, b is between 1 and 6, c is between 80 and 490, d is between 1 and 200, c/(b+1) is between 40 and 70, and c/b is between 46.7-140.