SU1456360A1 - Method of reactivating zeolites - Google Patents

Abstract

The invention relates to methods for reactivating zeolites used in the processes of fine drying and cleaning gases from thiols, and reduces the degree of amorphization and increases the degree of reduction of the adsorption capacity, the bone of zeolites. The inert gas (nitrogen) is mixed with oxygen in the mixer mixer and the analyzer is used to determine the required oxygen concentration of 0.5–5% by volume. The prepared mixture is sent to a coil oven with a temperature regulator for heating to 105-350 0 and then fed to an aerosol chamber, where it is mixed with a dry activator with an initial concentration of activator equal to 0.01-0.1 wt.%. The following compounds were used as activators: (NH4) iSiOe, KjS-jOg, KMn04, K, jMnO, NaMnO, Na.jMnO, (N4) 2, (NH4) Cr04. Aerosol mixture is fed into the reactor. At the outlet of the reactor, the concentration of CO and COj in the stream is determined using an analyzer. After the detection of COj, which indicates the beginning of burning, the temperature in the zeolite layer is increased at a rate of 75-100 / h. When reaching 350 ° C, the temperature rise is stopped, gradually reducing the concentration of the activator in the stream to O, and the oxygen content is increased to 5%. Reactivation is carried out until CO and COi disappear in the stream at the outlet of the reactor. Subsequent cooling of the zeolite is carried out by passing a stream of cold nitrogen or dry purified hydrocarbon gas. 1 hp f-ly, 1 tab. (L 4ib cd a soa

Description

one

This invention relates to methods for reactivating zeolites used in fine drying processes and gas purification from thiols.

The purpose of the invention is to reduce the degree of amorphization of zeolites and increase the degree of recovery of their adsorption capacity of capacity.

Example. In a temperature-controlled metal reactor 0 25 mm and a height of 400 mm load 100 g of deactivated zeolite NaX. The coke concentration is 0.92% by weight.

The prepared mixture of gases Nj and 0, with a concentration of 5 vol.%, Is heated in a coil oven to 105 ° C and fed into an aerosol chamber. The flow rate of nitrogen (K7) is 700 liters per hour, oxygen (Au) is 3.5 liters per hour.

(NH4) iSiOj - 0.8 g / h (concentration of activator in the mixture is 0.1 wt.%).

The aerosol mixture is fed into the reactor, after the appearance of COt at the outlet is increased, the temperature of the mixture is up to 350 ° C at a rate of 100 degrees / h (i.e. for 2.5 hours), after which the temperature rise is stopped and the reactivation is carried out until it disappears CO and COj at the exit of the reactor, reducing the flow of activator to O and increasing the oxygen consumption to 35 l / h.

Consumption NJ and 0 regulate using 1456360

. are activators of the process and give a degree of recovery of the adsorption capacity of not more than 29.0 wt.% by CHjSH and 26 wt.% by.

 The table shows the results of tests on the reactivation of zeolites.

Check the proposed method on. zeolites CAh and CaA shows that

The 10 degree of recovery of their adsorption capacity also increases dramatically both in CHgSH and in comparison with the known method.

Thus, the use of pre-Parvort N- and 0l regulate with ic-v, .-. -g7

: -i..i .. “-. i-- - rGyGM Go: ™ in

20

activator - with the help of known in the technique of special dosing one-shoulder weights.

After oxidative reactivation, the reactor is cooled and analyzed. Analysis results

May.%:

Residual concentration of non-volatile carbon deposits (coke)

Degree of amorphization

CHjSH

Hio

The degree of recovery of the adsorption capacity

SNZZN

Conducted studies of the effectiveness of using other substances taken from the same classes as the proposed activators, for example, persulphate sodium phata (), manganese dioxide (MpO), sodium dichromate (LiCGa.Ot), show that they are not

This will increase the degree of recovery of the adsorption capacity for HjO by 2.4 times, and for CHjSH by 2.2 times, compared to the known method, reduce amorphization of the zeolite by 20 times, thereby increasing its service life with an overall decrease in oxygen consumption and reactivation time .

Claims (2)

1. A method for reactivating zeolites, including treating a zeolite heated with an oxygen-containing gas, is due to the fact that, in order to reduce the degree of amorphization and increase the degree of restoration of the adsorption capacity of the zeolite, the oxygen-containing gas is mixed before treatment I with an aerosol activator-persulfate potassium or ammonium, or perman with sodium or potassium ganate, or manga with sodium, potassium or sodium, or bichromate or ammonium chromate. 2. A method according to claim 1, characterized in that the content of the activator in the mixture is 0.01-0.1% by weight. 360 . are activators of the process and give a degree of recovery of the adsorption capacity of not more than 29.0 wt.% by CHjSH and 26 wt.% by.  The table shows the results of tests on the reactivation of zeolites. Check the proposed method on. zeolites CAh and CaA shows that The 10 degree of recovery of their adsorption capacity also increases dramatically both in CHgSH and in comparison with the known method. Thus, the use of predic v, .-. -g7 - rGo GoM ™: ™ in  GGGo Go: ™ in This will increase the recovery rate of the adsorption capacity for HjO by 2.4 times, and for CHjSH by 2.2 times in comparison with the known method, reduce amorphization of the zeolite by 20 times, thereby increasing its service life with an overall decrease in oxygen consumption and time reactivation. 25 Formula of bratis 1. A method of reactivating zeolites, including treating a zeolite with a heated oxygen-containing gas, is about the fact that, in order to reduce the degree of amorphization and increase the degree of recovery of the adsorption capacity of the zeolite, oxygen-containing gas is mixed with I potassium persulfate or ammonium or sodium permanganate or potassium, or potassium manganate or sodium, or bichromate or ammonium chromate. 2. A method according to claim 1, characterized in that the content of the activator in the mixture is 0.01-0.1 wt.%. . " G. "H S g 0 " g " about "L about t. 1L eo. ( - Ot ON " . t 00 - oo o 1L g tn S about r o eo 00 00 oo about 00 MF 1L  in s te to about TO § Pi U- in oh oh U five ° sh lg about - 00 ate LO sch about "Ъ about sch sch about l ON 00 about "-. “H sch “- with about "" "H t -CJN with “00 2 ri l p o see with “H sch from h 04 sch go see go about - about f- o go ft about sch Cvl 04 CS Och sc och - .. o you go oh go oh oh o you go oh oh about 1L go  about 00 00 in - about  S o o “- t f txi Ui O t 00 ON p about oo 00 Ltd about "P 1L 1A  ABOUT ate (ft about 0400 "about cho Yu Yu ft about ON about Oi about 00 1L Yu 00 about sch VO tГ I "1" YAOO - yr 1L MS 00 sch g 1L " Mr ON go ON g about "K- shch BUT O go "ON go g - f sch " "S 4t g m about with SP sch t h sch 1L I mean 00 k sch go about eight - sco go go about VO about go m about g sch S sch sch 0 sch PTS sch ts ON sch ON mid 0h (H O1 hch ai h about t4 04 about 1L with eight about 1G | go oh oh about 1L with eight about 1L .go oh oh about 1L m ABOUT about about "L go about about about in with about about about sh p oh oh about 1L go  ABOUT o you go 3  § oh oh  S  § oh oh w t - 00 about m about CJ S and and S P) P) g (d z . J. r-l tS (P MF MF in sch vO r MF CO Cv) about - with hch about - about" G4 O “ to "L 1L - about No. o " R about" N about "L 1g-M - P4 W with “h about f - g-it. h " PTS Cg i Och with rg OO eat m chg a about VO 3 f one with at" I i5 t "o f .Ok about   v - "K 00 sch I about About 1A