摘要:
The object is to prevent deterioration and loss of dicyanobenzene in producing dicyanobenzene by ammoxidation of xylene to thereby achieve industrial and economical advantage in producing of dicyanobenzene. The method for producing dicyanobenzene of the present invention includes: contacting a xylene-ammoxidation reaction gas containing dicyanobenzene in ammoxidation of xylene with an organic solvent so as to obtain a dicyanobenzene-absorbing solution; contacting the dicyanobenzene-absorbing solution with a basic aqueous solution containing a salt such as ammonium carbonate so as to extract a water-soluble salt formed by neutralization reaction between carboxylic acid in the dicyanobenzene-absorbing solution and a base in the basic aqueous solution into an aqueous phase; separating the mixture of the dicyanobenzene-absorbing solution and the basic aqueous solution into an organic phase and an aqueous phase; decomposing the salt such as ammonium carbonate contained in the organic phase for separation of the salt from the organic phase; and distilling the organic phase to separate low boiling point compounds contained in the organic phase from the organic phase so as to obtain dicyanobenzene.
摘要:
A method for producing meta-xylylenediisocyanates includes a reaction step in which monohalogenated benzenes, formaldehydes, and an amide compound represented by general formula (1) below are allowed to react in the presence of an acidic liquid to produce a bisamide compound; a dehalogenation step in which in the bisamide compound, the halogen atom derived from the monohalogenated benzenes is replaced with a hydrogen atom; and a thermal decomposition step in which the bisamide compound from which the halogen atom is eliminated is subjected to thermal decomposition. In the reaction step, the acidic liquid contains inorganic acid, the equivalent ratio of the hydrogen atom of the inorganic acid relative to the monohalogenated benzenes is more than 14, the acidic liquid has an inorganic acid concentration of more than 90 mass %, and the reaction temperature is more than 10° C.General formula (1): wherein R1 represents an alkoxy group or an amino group.
摘要:
A method of producing xylylenediamine from xylene. In the method, xylene is converted into dicyanobenzene by ammoxidation. The produced dicyanobenzene is extracted into an organic solvent. The extract is then distilled to separate dicyanobenzene from the organic solvent. After added with a solvent, the separated dicyanobenzene is hydrogenated in a liquid phase. Finally, the hydrogenation product is purified by distillation to obtain a highly pure xylylenediamine. The method is conducted in a simple and low energy-consuming process.
摘要:
Supported catalysts comprising a support having a mean diameter of ≦78 μm, a vanadium oxide, an antimony oxide, one or more alkali metal or alkaline earth metal oxides, and one or more oxides of tungsten, molybdenum, titanium, iron, cobalt, nickel, manganese, potassium, copper or mixtures thereof; processes for preparing said catalysts; and processes for preparing an aromatic or heteroaromatic nitrile in the presence of such a supported catalyst.
摘要:
The methods of the present invention relate to reducing and eliminating waste oxide gas emissions, produced by a first industrial process, by utilizing the emissions in a second industrial process that either is benefited by or tolerates the components of the waste oxide gas stream. These methods are applicable to numerous combinations of first industrial processes and second industrial processes.
摘要:
A carbocyclic or heterocyclic compound, ammonia and an oxygen-containing gas are subjected to fluid catalytic reaction in vapor phase in the presence of a catalyst containing alkali metal to produce an aromatic or heterocyclic nitrile. The use of the catalyst containing a specific amount of alkali metal enables the stable production of the aromatic or heterocyclic nitrile in high yields with little change with time even when water is present in the reaction system. The use of the catalyst containing the alkali metal also enables the recycle and reuse of unreacted ammonia which is usually accompanied by water, thereby reducing production costs.
摘要:
There is disclosed a process for producing a nitrile compounds by ammoxidation of a carbocyclic or heterocyclic compound having organic substituent(s) by reacting the compound with ammonia and an oxygen-containing gas, wherein unreacted ammonia is recovered from the reaction product gas and recycled to the reaction system.
摘要:
Vanadium-containing catalysts are obtained by using polyvanadic acid as a source of vanadium. Vanadium-containing catalysts are obtained by mixing catalyst components other than vanadium, or their precursors, with a polyvanadic acid sol which is formed by ion-exchanging a metavanadic acid aqueous solution with a proton-type cation-exchange resin and performing polycondensation, and by drying and/or calcining the mixture. Such vanadium-containing catalysts can fully exhibit their catalytic activity under mild reaction conditions, and can be suitably used for various reactions, such as synthesis of phthalic anhydride by the partial oxidation of o-xylene, synthesis of benzaldehyde by the partial oxidation of toluene, synthesis of benzoic acid by the partial oxidation of toluene, synthesis of anisaldehyde by the partial oxidation of p-methoxy toluene, synthesis of propylene by the oxidative dehydrogenation of propane, synthesis of isobutene by the oxidative dehydrogenation of isobutane, synthesis of methyl formate by the oxidative dehydrogenation of methanol, and synthesis of acrylonitrile by the ammoxidation of propane.
摘要:
The present invention relates to a novel silver aluminum borate composition useful as a catalyst for oxidation and/or ammoxidation reactions. More particularly the invention is directed to silver aluminum borate having the general formula (x) Ag.sub.2 O.(y) Al.sub.2 O.sub.3.(z) B.sub.2 O.sub.3 where x, y and z are numbers representing molar amounts of the oxides such that the mole fraction of Ag.sub.2 O, calculated as x/(x+y+z) is from about 0.35 to about 0.60, the mole fraction of Al.sub.2 O.sub.3, calculated as y/(x+y+z) is from about 0.10 to about 0.40, and the mole fraction of B.sub.2 O.sub.3, calculated as z/(x+y+z) is from about 0.10 to about 0.45. The invention is further directed to a method for preparing the catalyst, and to its use as an oxidation or ammoxidation catalyst.
摘要翻译:本发明涉及一种可用作氧化和/或氨氧化反应催化剂的新型硼酸铝硼酸盐组合物。 更具体地,本发明涉及具有通式(x)Ag 2 O(y)Al 2 O 3。(z)B 2 O 3的硼酸铝铝,其中x,y和z是表示氧化物的摩尔量的数,使得Ag 2 O的摩尔分数, 以x /(x + y + z)计算为约0.35至约0.60,以y /(x + y + z)计算的Al 2 O 3的摩尔分数为约0.10至约0.40,并且B 2 O 3的摩尔分数 以z /(x + y + z)计算为约0.10至约0.45。 本发明进一步涉及一种制备该催化剂的方法及其作为氧化或氨氧化催化剂的用途。
摘要:
The present invention provides a process for the preparation of pure 2,6-dichlorobenzonitrile by the ammonoxidation of 2,6-dichlorotoluene in the presence of a catalyst based on vanadium-molybdenum oxide, wherein the reaction is carried out in a fluidized bed process and water is sprayed into the reaction gases after leaving the fluidized bed reactor.