MVR evaporative concentration and recovery process for waste acid containing hydrochloric acid
A technology of evaporation, concentration and process, applied in the field of hydrochloric acid, which can solve the problems of reducing energy consumption and operating costs, high operating costs, and large floor area, and achieves the effects of low operating costs, stable system, and no secondary pollution
Inactive Publication Date: 2017-11-03
BEIJING PUREN MEIHUA ENERGY SAVING & ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology
[0005] Aiming at the above-mentioned deficiencies existing in the prior art, the technical problem to be solved by the present invention is, aiming at the high energy consumption faced in the current process of recovering hydrochloric acid from waste acid, high operating cost, large floor area, and secondary pollution etc
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[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.
[0016] like figure 1 As shown, the present invention proposes an evaporation process for recovering hydrochloric acid by evaporation and concentration from waste acid, using MVR evaporation and concentration to reduce energy consumption and operating costs.
[0017] The waste acid recycling hydrochloric acid MVR evaporation and concentration process of the present invention utilizes MVR negative pressure evaporation, which not only reduces energy consumption, but also satisfies...
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The invention relates to a MVR evaporative concentration and recovery process for waste acid containing hydrochloric acid. The process comprises the following four steps: preheating; MVR evaporative concentration; recovery of hydrochloric acid; and cooling crystallization of a concentrate. During preheating, a high-temperature concentrate containing considerable ferrous chloride and obtained after concentration by an evaporator No. 1 is used for preheating raw waste acid, and waste acid enters a preheating system via a feeding pump and is heated to an evaporation temperature; during MVR evaporative concentration, the preheated waste acid enters an evaporator system No. 1 and is mixed with circulating feed liquid in an evaporator No. 2, then the obtained mixture enters the evaporator No. 2, and then vapor-liquid mixed feed liquid is separated; during recovery of hydrochloric acid, process water and hydrochloric acid steam are subjected to heat exchanging in the evaporator No. 2, and hydrochloric acid steam is condensed to form thermal-state dilute hydrochloric acid; during cooling crystallization of the concentrate, changes of the concentration of the ferrous chloride concentrate are controlled, and discharging is reasonably controlled; and the ferrous chloride concentrate enters a concentrate cooling crystallization system so as to obtain ferrous chloride crystals. The MVR evaporative concentration and recovery process provided by the invention is stable in system, energy-saving and friendly to environment and can effectively overcome the problem of corrosion of high-temperature hydrogen chloride gas to equipment.
Description
technical field [0001] The invention relates to a regeneration and recovery process of waste acid containing hydrochloric acid, in particular to recovery of hydrochloric acid in waste acid by using an MVR evaporation concentration process. Background technique [0002] Hydrochloric acid is an important inorganic chemical product, which is widely used in dyestuffs, organic synthesis, food processing, printing and dyeing, rinsing, leather, metallurgy, steel and other industries. Such as a cold-rolled steel pickling unit with an annual output of 450,000 tons, it needs about 20,000 tons of hydrochloric acid per year, and the hydrochloric acid-containing waste liquid (about 5% hydrochloric acid, 10%-20% ferrous chloride) produced is nearly At 20,000 tons / year. In chemical production, the amount of waste acid containing hydrochloric acid produced every year cannot be counted. [0003] If the above waste acid is directly discharged to the environment, it will not only cause serio...
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Login to view more IPC IPC(8): C01G49/10C01B7/07
CPCC01B7/0706C01G49/10Y02P20/10
Inventor 于东川刘建军王晓茵
Owner BEIJING PUREN MEIHUA ENERGY SAVING & ENVIRONMENTAL PROTECTION TECH
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