Industrial hydrochloric acid is commonly mix chlorine hydric in synthesizing furnace combustion makes chloridize hydrogen gas, classics water is absorbed and become. Synthetic furnace temperature is very high, chlorine and steely furnace wall are contacted and react, in bringing about generated chloridize hydrogen gas, mix have; of vapour of 3 chloridize iron this kind of gas is carried in conduit in also can introduce foreign matter iron, the existence of iron makes hydrochloric acid hair yellow. The iron content of reagent hydrochloric acid has strict level, reason hydrochloric acid has important sense in hydrochloric acid production except iron. Producing reagent hydrochloric acid is commonly it is raw material to give chloridize hydrogen gas in the evaporate in vitreous boiler with industrial hydrochloric acid, or the chloridize hydrogen gas that produces by synthetic furnace is purified directly except miscellaneous.

Use colophony of A-21S ion exchange to divide iron, have de-ironing efficiency expenses of tall, operation low, equipment, operation is handy wait for an advantage, industrial device moves good. This craft can be used at low the industrial production that contains Tie Chun hydrochloric acid and reagent hydrochloric acid, iron content can amount to standard of analytic pure reagent.

Technology of A-21S colophony ion exchange eliminates iron principle

In thick hydrochloric acid, metallic ion basically exists with cooperating the form of anion, colophony of A-21S ion exchange is OK and effective the iron in ground eliminate thick hydrochloric acid is ionic, metal of other of eliminate of land of OK still and different level is ionic.

When the thick hydrochloric acid that contains impurity passes colophony of special type ion exchange, commutative process is as follows for exemple reaction with iron:

After colophony of A-21S ion exchange amounts to saturation to the adsorption of iron ion, can use ionic water (distilled water) undertake retexture, because hydrochloric acid pH indicator is reduced, have the following renewal process:

Classics of ion exchange colophony after retexture, restorable, can have exchange, renewal process repeatedly.

Test facilities and technological process

Test facilities can use fixed bed formula ion exchange manufactures technology, technological process sees a picture:

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Technology unit:

Equipment material is qualitative optional pvc, polyethylene be able to bear or endure hydrochloric acid corrodes material, conduit, valve can use polyvinyl chloride or vitreous data.

Test specimen: A-21S colophony;

Ion exchange column checks a note:

Note

① considers to decide specific resinite is accumulated, and choose appropriate commutative column;

Before ② moves, should undertake be turninged over appropriately washing; first

③ asks to consider the; such as resinous state environment according to the experiment

The height of ④ colophony bed should be 1000mm to 1200mm;

⑤ exalted chamfer is exchanging column to go up at least the; of velocity of flow that 2000mm anticipates with achieving

⑥ colophony column gives water to enter the; in the container that has bulk sign directly

⑦ work velocity of flow considers carefully, the attention gives the research; of water

⑧ adopts line of cartography of draw of sample sample period analysis, fill in proper record sheet;

⑨ drinks water not should cloudy and without obvious grain thing.

Second birth mechanism:

After adsorption of colophony of A-21S anion exchange is saturated, can use ionic water to undertake wash out, iron ion wash out goes down, colophony is changed and restore to comprise a form formerly, obtain second birth.

Ion exchange resinous is used

Ion exchange law eliminates iron equipment, process simple, can make the matter content of hydrochloric acid (contain iron) jump by Ppm amount class raise Ppb amount level.

Colophony processing

This craft chooses colophony of ion exchange of A-21S special type. When colophony leaves factory, be commonly chloric model, the beard before using goes ionic water immerses and be being rinsed, and eliminate machinery impurity and suspension content.

Hold post

Will treated colophony and water charge trade together in column (the valve below column should shut) , fill stops highly to the regulation, should notice to avoid bleb carry secretly to go in when fill. Waste liquid discharge valve is adjusted in the process that hold post, make 5cm of layer of colophony of fluid face prep above advisable.

Exchange divides iron

In will waiting for the hydrochloric acid pump of processing to enter colophony column, open a powerful person that take sick at heart to reach valve giving sick at heart, close other valve, adjust amount of open of a powerful person giving sick at heart, control velocity of flow is) of multiple of colophony bed bulk in the 5-10BV(BV when every. When beginning to give sick at heart, acerbity chroma is inferior, lift gradually after that, measure acerbity concentration ceaselessly with densimeter, when amounting to a regulation to ask, begin to pack for finished product acid namely. The rare acid that did not amount to chroma requirement should be deposited alone, absorb fluid with returning chloridize hydrogen. In exchanging a process, should the content of the iron in hydrochloric acid of timing sampling analysis, when iron content exceeds a level, should halt trade and undertake colophony second birth is operated.

Second birth

Use ionic water to use refluent means to undertake rinsing to colophony, control of velocity of flow is when every 4BV. Eduction fluid is the waste liquid that contains a large number of 3 chloridize iron, need to be handled separately. When rinsing, need to examine ceaselessly the content of the iron in eluant, to the end is rinsed when having iron. Right now operation of colophony second birth completes, can undertake commutative a process afresh.

Note

(1) handles acerbity chroma ≥31% , low at 28%;

(2) this process is microtherm physisorption, hydrochloric acid temperature is between ℃ of 20 ℃ ~30;

(Run time and raw material contain 3) iron is concerned. Fix appropriate cycle of run through computation and practice, in order to ensure processing hydrochloric acid contains iron qualification;

(What after 4) colophony investment is used, should notice equipment moves is successional, if stop confidential for long,do clean second birth.