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:
In the production method of the invention, a cyclic aldehyde having an alkyl group and/or a cycloalkyl group directly bonded to a skeletal ring and a formyl group directly bonded to the skeletal ring is brought into contact with ammonia and oxygen in vapor phase in the presence of a catalyst. As a result thereof, the formyl group is selectively ammoxidized into a cyano group to convert the cyclic aldehyde into a corresponding cyclic nitrile. The method enables a long-term, high-yield production of the cyclic nitrile using a reduced amount of ammonia.
摘要:
In a process for producing a nitrile compound comprising introducing a carbon ring or heterocyclic compound having organic substituents, ammonia and the air into a reactor and reacting the introduced compounds in the presence of a catalyst, during the reaction, a residual gas obtained after the formed nitrile compound is separated from a reaction gas discharged from the reactor is recycled to the reactor in an amount of 10 to 60% by volume based on the amount of the fresh raw material gas supplied to the reactor and the ratio of the amount by mole of molecular oxygen to the amount by mole of the organic substituent in the carbon ring or heterocyclic compound having organic substituents supplied to the reactor (O2/organic substituent) is kept within 1.5 to 7. The reaction is achieved under an advantageous condition and the nitrile compound can be produced industrially advantageously at a higher yield.
摘要:
There are disclosed a process for producing a nitrile compound which comprises catalytically reacting an alkyl group-substituted aromatic compound or an alkyl group-substituted heterocyclic compound with a mixed gas containing ammonia and oxygen in the presence of 1 a catalyst comprising a vanadium oxide, a chromium oxide, a boron oxide, a molybdenum oxide, and an oxide of an alkali metal or an alkaline earth metal or 2 a catalyst comprising a vanadium oxide, a chromium oxide, a boron oxide, an alkali metal oxide, and a heteropolyacid. According to the above process and by virtue of the specific catalyst, it is made possible to produce a nitrile compound having an aromatic ring or a heterocyclic ring in an extremely advantageous manner, that is, in high yield at high selectivity to the objective product.
摘要:
A nuclear halogenated aromatic compound possessing cyano groups is produced by a method using as a raw material an aromatic compound which possesses cyano groups and assumes a solid state at room temperature and subjecting the raw material to a procedure comprising a step of melting and transporting the compound by a means transport-melting, a step of vaporizing the compound, a step of mixing the compound with a halogen gas, and a step of causing the vapor of the compound to react with the halogen gas in vapor phase in the presence of a catalyst sequentially in the order mentioned, which comprises maintaining a content of a self-condensate of the aromatic compound possessing cyano groups which arise during the melting of the aromatic compound possessing cyano groups in a gas of the compound which reacts with the halogen gas to a level of not more than 2.5 mol % based on the compound. The catalyst used in the method is activated carbon such that the average pore radius thereof determined by the nitrogen adsorption method is not less than 12.2 .ANG. and the cumulative pore volume of the portion of the activated carbon having pore radiuses in the range of 5-100 .ANG. determined by the steam adsorption method is not less than 0.45 g/cc.
摘要翻译:具有氰基的核卤代芳族化合物是通过使用具有氰基并在室温下呈现固态的芳族化合物作为原料的方法制备的,并使原料经历包括熔融和输送化合物的步骤 通过输送熔融的方法,使化合物蒸发的步骤,将化合物与卤素气体混合的步骤以及在催化剂存在下使化合物的蒸气与气相反应的步骤 按照上述顺序依次进行,其包括将与卤素气体反应的化合物的气体中具有氰基的芳香族化合物熔融时产生的具有氰基的芳香族化合物的自缩合物的含量保持在一定水平 不大于2.5摩尔%。 该方法中使用的催化剂是活性炭,使得其通过氮吸附法测定的平均孔半径不小于12.2安培,并且具有孔半径的活性炭部分的累积孔体积在5-100范围内 蒸汽吸附法测定的ANGSTROM不低于0.45 g / cc。
摘要:
A process for producing 2,6-dichlorobenzonitrile by ammoxidation comprising contacting a starting gas consisting of 2,6-dichlorotoluene, air and ammonia, which comprises carrying out this reaction under the following conditions:(a) the concentration of 2,6-dichlorotoluene in the starting gas is 2.6 mole % or more.(b) the reactor effluent gas is contacting with water to cool to a temperature in the range of 50.degree. to 90.degree. C., whereby 2,6-dichlorobenzonitrile in the reactor effluent gas is collected as a slurry in which solidified 2,6-dichlorobenzonitrile is dispersed in water, and 2,6-dichlorobenzonitrile is obtained from the slurry, and(c) the cooled reactor effluent gas from which 2,6-dichlorobenzonitrile has been removed is contacted with water again to cool to a temperature in the range of 0.degree. to 40.degree. C., whereby unreacted 2,6-dichlorotoluene in the gas is collected as a dispersion in which it is dispersed in water and 2,6-dichlorotoluene is recovered from the dispersion.Also, there is disclosed a process for purifying 2,6-dichlorobenzonitrile obtained by subjecting 2,6-dichlorotoluene to ammoxidation, which comprises subjecting the 2,6-dichlorobenzonitrile to solid-liquid separation procedure in a molten state.
摘要:
Magnesium-aluminum, hydrotalcite-type clay compositions containing large, pillaring organic, inorganic, and mixed organic/inorganic anions have been made. Heating of the mixed large organic/inorganic anion hydrotalcite-type clays can lead to substantially complete removal of the organic anions and a route to making large, inorganic-anion, hydrotalcite-type clays with more open galleries. These materials are shown to catalyze hydrocarbon conversion reactions.
摘要:
IN THE VAPOR PHASE AMMOXIDATION OF M-XYLENE TO ISOPHTHALONITRILE, THE IMPROVEMENT WHICH COMPRISES COOLING THE GASEOUS PRODUCTS FROM THE AMMOXIDATION REACTOR TO TEMPERATURE AND PRESSURE CONDITIONS WHICH WILLMAINTAIN SAID ISOPHTHALONITRILE IN THE LIQUID PHASE, SEPARATING VOLATILES FROM SAID LIQUID ISOPHTHALONITRILE, AND RECOVERING HIGHLY PURIFIED LIQUID ISOPHTHALONITRILE AS BOTTOMS.