PDF Publication Title:
Text from PDF Page: 003
dilute brine. The hydrogen removed in the cathode chamber is cooled and purified by removal of oxygen, then used in other plant processes or sold. 8.11.2.2 Mercury Cell - Figure 8.11-2 shows a simplified block diagram for the mercury cell process. The recycled brine from the electrolysis process (anolyte) is dechlorinated and purified by a precipitation-filtration process. The liquid mercury cathode and the brine enter the cell flowing concurrently. The electrolysis process creates chlorine at the anode and elemental sodium at the cathode. The chlorine is removed from the anode, cooled, dried, and compressed. The sodium combines with mercury to form a sodium amalgam. The amalgam is further reacted with water in a separate reactor called the decomposer to produce hydrogen gas and caustic soda solution. The caustic and hydrogen are then separately cooled and the mercury is removed before proceeding to storage, sales, or other processes. 8.11.3 Emissions And Controls4 Tables 8.11-1 and 8.11-2 are is a summaries of chlorine emission factors for chlor-alkali plants. Factors are expressed in units of kilograms per megagram (kg/Mg) and pounds per ton (lb/ton). Emissions from diaphragm and mercury cell plants include chlorine gas, carbon dioxide (CO2), carbon monoxide (CO), and hydrogen. Gaseous chlorine is present in the blow gas from liquefaction, from vents in tank cars and tank containers during loading and unloading, and from storage tanks and process transfer tanks. Carbon dioxide emissions result from the decomposition of carbonates in the brine feed when contacted with acid. Carbon monoxide and hydrogen are created by side reactions within the production cell. Other emissions include mercury vapor from mercury cathode cells and chlorine from compressor seals, header seals, and the air blowing of depleted brine in mercury-cell plants. Emissions from these locations are, for the most part, controlled through the use of the gas in other parts of the plant, neutralization in alkaline scrubbers, or recovery of the chlorine from effluent gas streams. Table 8.11-3 presents mercury emission factors based on 2 source tests used to substantiate the mercury national emission standard for hazardous air pollutants. Due to insufficient data, emission factors for CO, CO2, and hydrogen are not presented here. 7/93 (Reformatted 1/95) Inorganic Chemical Industry 8.11-3PDF Image | chlor-alkali electrolysis process
PDF Search Title:
chlor-alkali electrolysis processOriginal File Name Searched:
chlor-alkali.pdfDIY PDF Search: Google It | Yahoo | Bing
Salgenx Redox Flow Battery Technology: Power up your energy storage game with Salgenx Salt Water Battery. With its advanced technology, the flow battery provides reliable, scalable, and sustainable energy storage for utility-scale projects. Upgrade to a Salgenx flow battery today and take control of your energy future.
| CONTACT TEL: 608-238-6001 Email: greg@salgenx.com | RSS | AMP |