The Adsorption and Desorption Breakthrough Behavior of Hydrogen Chloride Gas Mixture on Zeolite 13X Pellet in a Fixed Bed Reactor

2015 ◽  
Vol 48 (3) ◽  
pp. 202-211 ◽  
Author(s):  
Jae-Young Kim ◽  
Dae-Hyun Kyung ◽  
Young Cheol Park ◽  
Sung-Ho Jo ◽  
Ho-Jung Ryu ◽  
...  
Keyword(s):  
Hydrogen Chloride ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Gas Mixture ◽  
Adsorption And Desorption ◽  
Zeolite 13X

Reaction of Hydrogen Chloride Gas with Sodium Carbonate and Its Deep Removal in a Fixed-Bed Reactor

2014 ◽  
Vol 53 (49) ◽  
pp. 19145-19158 ◽  
Author(s):  
Miloslav Hartman ◽  
Karel Svoboda ◽  
Michael Pohořelý ◽  
Michal Šyc ◽  
Siarhei Skoblia ◽  
...  
Keyword(s):  
Hydrogen Chloride ◽  
Sodium Carbonate ◽  
Fixed Bed ◽  
Fixed Bed Reactor

Recovery of Chlorine from Anhydrous Hydrogen Chloride

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Usha Virendra Reddy ◽  
Vijaya Lakshmi Cheedipudi ◽  
Satyavathi Bankupalli ◽  
Viswanath Kotra
Keyword(s):  
Hydrogen Chloride ◽  
Waste Disposal ◽  
Copper Chloride ◽  
Fixed Bed ◽  
Raw Material ◽  
Toxic Waste ◽  
Fixed Bed Reactor ◽  
Stable Operation ◽  
Titanium Chloride ◽  
Disposal Problem

Chlorine and hydrogen chloride are classified as potentially hazardous and toxic chemicals. Large-scale industrial processes worldwide use chlorine as primary raw material from which hydrogen chloride is obtained as a major byproduct. Hydrogen chloride is sold as aqueous HCl or used as a raw material for the production of chlorinated products, but the quantity of HCl produced by chlorine processes is much more than what the market can absorb, resulting in a toxic waste disposal problem. Recovery of material chlorine from this hydrogen chloride is very important and is of utmost industrial interest as it would cut down on the production of chlorine at the same time solve the waste disposal problem. It is theoretically possible to convert hydrogen chloride to chlorine for the recycling and reuse of chlorine. In this paper we have developed a process for recovery of chlorine from anhydrous hydrogen chloride obtained as a byproduct during low temperature vapor phase hydrolysis of titanium chloride to get TiO2. It is a two-stage process where chlorination is carried out in a fixed bed reactor using copper oxide catalyst at a temperature in the range of 423-523 K followed by oxidation of copper chloride catalyst in a second fixed bed reactor operating at 573-653 K. This process operates under conditions in which the catalyst does not volatilize and in which the activity of the catalyst remains stable. Operation at relatively moderate temperature prevents corrosion and minimizes the extrinsic energy input required. The chlorine recovery process makes the new generation chloride process for synthesis of TiO2 economical.

Reactivity of the solid sodium carbonate towards the gaseous hydrogen chloride and the sulphur dioxide

1983 ◽  
Vol 48 (12) ◽  
pp. 3500-3507 ◽  
Author(s):  
Karel Mocek ◽  
Erich Lippert ◽  
Emerich Erdös
Keyword(s):  
Hydrogen Chloride ◽  
Sodium Carbonate ◽  
Sulphur Dioxide ◽  
Active Form ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Anhydrous Sodium Carbonate ◽  
A Value ◽  
Partial Pressures ◽  
Inactive Form

The rate of reaction of the anhydrous sodium carbonate with the hydrogen chloride and its mixture with sulphur dioxide was measured in an integral fixed-bed reactor. Reactivity of the active sodium carbonate towards the hydrogen chloride is lower as compared with its reactivity towards the sulphur dioxide. A relationship was found between the reactivity of the solid and the way of its preparation. The inactive form of the sodium carbonate is inactive towards both the sulphur dioxide and the hydrogen chloride. The active form of the sodium carbonate exhibits towards the hydrogen chloride a reactivity which is by orders of magnitude higher than that of the inactive form. The variation of the ratio of partial pressures of the hydrogen chloride and the sulphur dioxide in the reaction with the sodium carbonate does not affect significantly the total degree of the solid conversion, which attained a value of 65% in laboratory experiments. The degree of gas purification from the acid components did not fall under a value of 99% up to a solid conversion of about 50% at a mean gas contact time of about 10-2 s.

Reaction of Solid Sorbents with Hydrogen Chloride Gas at High Temperature in a Fixed-Bed Reactor

2005 ◽  
Vol 19 (6) ◽  
pp. 2229-2234 ◽  
Author(s):  
Binlin Dou ◽  
Bingbing Chen ◽  
Jinsheng Gao ◽  
Xingzhong Sha
Keyword(s):  
High Temperature ◽  
Hydrogen Chloride ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Solid Sorbents

Role of filter media in an anaerobic fixed-bed reactor

1995 ◽  
Vol 31 (9) ◽  
pp. 137-144 ◽  
Author(s):  
T. Miyahara ◽  
M. Takano ◽  
T. Noike
Keyword(s):  
Anaerobic Bacteria ◽  
Fixed Bed ◽  
Methanogenic Bacteria ◽  
The Other ◽  
Fixed Bed Reactor ◽  
Filter Media ◽  
Fixed Bed Reactors ◽  
Attached Bacteria ◽  
The Relationship

The relationship between the filter media and the behaviour of anaerobic bacteria was studied using anaerobic fixed-bed reactors. At an HRT of 48 hours, the number of suspended acidogenic bacteria was higher than those attached to the filter media. On the other hand, the number of attached methanogenic bacteria was more than ten times as higher than that of suspended ones. The numbers of suspended and deposited acidogenic and methanogenic bacteria in the reactor operated at an HRT of 3 hours were almost the same as those in the reactor operated at an HRT of 48 hours. Accumulation of attached bacteria was promoted by decreasing the HRT of the reactor. The number of acidogenic bacteria in the reactor packed sparsely with the filter media was higher than that in the closely packed reactor. The number of methanogenic bacteria in the sparsely packed reactor was lower than that in the closely packed reactor.

Modeling of aerated upflow fixed bed reactors for nitrification

1999 ◽  
Vol 39 (4) ◽  
pp. 85-92 ◽  
Author(s):  
J. Behrendt
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Liquid Phase ◽  
Gas Phase ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Bulk Liquid ◽  
Initial Value ◽  
Fixed Bed Reactors ◽  
Number Of Cells

A mathematical model for nitrification in an aerated fixed bed reactor has been developed. This model is based on material balances in the bulk liquid, gas phase and in the biofilm area. The fixed bed is divided into a number of cells according to the reduced remixing behaviour. A fixed bed cell consists of 4 compartments: the support, the gas phase, the bulk liquid phase and the stagnant volume containing the biofilm. In the stagnant volume the biological transmutation of the ammonia is located. The transport phenomena are modelled with mass transfer formulations so that the balances could be formulated as an initial value problem. The results of the simulation and experiments are compared.

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