In a process for producing chemical substances comprising steps of cooling, condensing and solvent-absorbing the reaction product gas having a high temperature formed in a reactor, an absorption type refrigerator or an absorption type heat pump is driven by using, as the driving source, a heat sourc
In a process for producing chemical substances comprising steps of cooling, condensing and solvent-absorbing the reaction product gas having a high temperature formed in a reactor, an absorption type refrigerator or an absorption type heat pump is driven by using, as the driving source, a heat source having such a temperature as not to be advantageous for the heat exchange in the process, which heat source has been taken out of the steps of cooling the reaction product gas, condensing it or solvent-absorbing it to obtain a refrigerant or a hot water having a temperature higher than the temperature of the heat source, and the refrigerant or the hot water is used as a cooling source or a heating source in the steps comprised in said process for producing chemical substances.
대표청구항▼
A method for recovering and utilizing waste heat in the production of an unsaturated nitrile by cooling with water in a quenching column a reaction mixture comprising an unsaturated nitrile, a saturated nitrile and hydrogen cyanide formed by the ammoxidation reaction of an olefin, absorbing reaction
A method for recovering and utilizing waste heat in the production of an unsaturated nitrile by cooling with water in a quenching column a reaction mixture comprising an unsaturated nitrile, a saturated nitrile and hydrogen cyanide formed by the ammoxidation reaction of an olefin, absorbing reaction mixture into an absorption water in an absorption column, subjecting the resulting absorption solution to an extractive distillation by the use of solvent water in a recovery column, thereby obtaining a distillate comprising the unsaturated nitrile and hydrogen cyanide from the top of the column, and removing by distillation the hydrogen cyanide and water from the distillate in distillation columns in a de-hydrogen cyanide column, a dehydration column, a product column wherein the solvent water withdrawn from the side part of the stripping column and freed substantially from the fraction comprising the unsaturated nitrile and hydrogen cyanide contained in the feed to the recovery column without passing through an acetonitrile-stripping column is circulated as the absorption water in the absorption column or the solvent water withdrawn from the lower part of the recovery column and freed from acetonitrile substantially by passing through an acetonitrile stripping column is circulated as the solvent water in the recovery column and/or as the absoprtion water in the absorption column, characterized in that an absorption refrigerator or an absorption heat pump is driven by using, as its driving source, at least one heat source at a temperature of not more than 100°C. selected from the group consisting of the circulating water in the quenching column, the solvent water circulated as the solvent water in the absorption solumn and the recovery column, the vapor distilled out from the top of the recovery column and the vapor distilled out from the top of the dehydration column, to obtain a refrigerant or hot water having a temperature higher than the temperature of the heat source, and said refrigerant is used for cooling at least one member selected from the group consisting of the absorption water in the absorption column, the overhead vapor of the de-hydrogen cyanide column and the unsaturated nitrile withdrawn from the product column and/or hot water is used as at least one heat source selected from those of the distillation columns of the de-hydrogen cyanide column, the dehydration column, and the product column. A method for recovering and utilizing waste heat in the production of hydrogen cyanide by the ammoxidation of methane comprising feeding methane, ammonia and air to a reactor in the presence of a catalyst to yield a gaseous mixtute comprising mainly hydrogen cyanide and further containing unreacted ammonia, passing the gaseous mixture through a waste heat boiler, passing the mixture from the boiler to an ammonia-absorption column, circulating an aqueous solution of sulfuric acid through the top of an ammonia-adsorption column so as to flow down the ammonia-adsorption and cool the gas and simultaneously convert the unreacted ammonia to ammonium sulfate, said sulfuric acid solution at a temperature of not more than 100°C. passing from the bottom of the ammonia-adsorption column through an adsorption refrigerator and circulating back to the ammonia-adsorption column so as to produce a refrigerant, discharging the ammonium sulfate from the bottom of the ammonia-adsorption column, directing the gas from which ammonia had been removed in the ammonia-adsorption column to a cooling column wherein the gas is cooled while in contact with circulating cooling water flowing down from the top of the cooling column, directing cooled gas from the cooling column to an adsorption column wherein low temperature absorbing water enters the top of the adsorption column and flows down the adsorption column, directing an absorption solution from the bottom of the adsorption column to a rectifying column, subjecting the hydrogen cyanide distilled out of the top of the rectifying column to partial condensation in a partial condenser to separate water, directing the hydrogen cyanide from the partial condenser to a condenser to condense the hydrogen cyanide, passing the condensed hydrogen cyanide to a tank, directing a bottom stream from the rectifying column to a heat exchanger to preheat the absorption solution, and utilizing said refrigerant produced in the refrigerator in at least one member of the group consisting of the cooler in the adsorption column, the partial condenser the condenser and the tank.
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