摘要:
This invention relates to the methods and installations for producing ultra pure sodium chloride salt crystals primarily for use in saturating depleted brine resulting from the electrolytic decomposition of saturated brine in chlor alkali membrane cells for the production of chlorine, caustic soda and hydrogen. More particularly, this invention related to the production of ultra pure sodium chloride salt crystals by processing primary treated brine by first acidifying the primary treated brine, then stripping the carbonic acid produced by acidification as carbon dioxide, and then returning the brine to a pH of about 6 or higher which is sufficient for processing it in evaporation equipment where the ultra pure salt crystals are produced.
摘要:
Disclosed is an electrode for use in electrochemical processes wherein a metal substrate made of a valve metal such as titanium carries an electrocatalytically active coating such as an oxide selected from the group consisting of manganese, iron, cobalt, or nickel applied in a series of layers wherein particles of fibers of various filler materials such as titanium, other valve metals, tin oxide, titanium oxides, manganese oxide, quartz, silica, and alumina were admixed with the top coating material.
摘要:
The present invention refers to a process for electrolysis of brine by mercury cathodes, being the latter cathode separated from the anode by a porous diaphragm or membrane with diameter of pore such that mercury cannot pass through it.
摘要:
A process for making alkali hydroxide and chlorine in a plurality of electrolytic cells of the amalgam type, wherein a decomposer is provided for each cell and wherein alkali metal amalgam formed in the cell is reacted with water in a companion decomposer to form alkali hydroxide, the improvement comprising utilizing for each cell and corresponding decomposer a condenser and a separator component between the condenser and decomposer in the hydrogen outlet line of the decomposer to separate mercury vapor and water vapor initially liquefied in the condenser and divert the condensed mercury back into the decomposer.
摘要:
An improved process for the production of halogens and alkali metal hydroxide by electrolysis of aqueous solution of alkali metal halides in a flowing mercury electrolysis cell wherein the salt solutions do not have to purified and to novel amalgam denuders and a mercury electrolytic cell plant without a salt purification step.
摘要:
In a process for purifying raw brine containing dissolved strontium, calcium and magnesium impurities wherein the raw brine is treated by contacting the brine with sodium carbonate for precipitation of strontium and calcium carbonate, contacting the brine containing the strontium and calcium carbonate solids with sodium hydroxide for precipitation of magnesium hydroxide, and removing strontium carbonate, calcium carbonate and magnesium hydroxide solids from the sodium chloride brine, the improvement which comprises passing at least a portion of said removed solids to the zone wherein the raw brine is contacted with sodium carbonate.
摘要:
A method for regulating and controlling the anode current and for avoiding short-circuits between the adjustable anodes and the cathode of an electrolysis cell, wherein by means of an apparatus controlled by a field plate (magnetically controllable resistance), a magnetic diode or a magnetic transistor as sensor, the electrical resistance of which constitutes a measure for the current flowing to an anode or an anode group and, thus, having a nominal value of the resistance for a nominal value of the current, in case there is a deviation of the current from the nominal value the deviation of the electrical resistance of the sensor from the nominal value serves to reset the electrical resistance of the sensor and, thus, also the current of the anode or anode group to the nominal value by adjusting the anode or anode group.
摘要:
A process for the reduction of thick mercury on the baseplate of a mercury cell which comprises dispersing water or an aqueous medium (preferably brine) continuously or intermittently at one or more stations along the line of amalgam flow without interruption of the electrolysis. It is preferred to inject water or brine in part or whole of the stream of amalgam returning from the denuder to the cell, for example by means of an emulsifier located between the denuder and the cell or by injecting water into the amalgam pump.
摘要:
In the electrolysis of an alkali metal chloride in a cell containing mercury there is produced an alkali metal amalgam which is withdrawn and decomposed to regenerate mercury containing impurities introduced from the alkali metal chloride. The impure mercury is mixed turbulently with an aqueous solution of sulfuric acid having mercury (I) sulfate dissolved or suspended therein whereupon the impurities are extracted into the solution and the purified mercury is recycled.
摘要:
A process for recovering mercury from a mercury-containing gas which includes mixing chlorine with the gas, then passing the mixture through a gas-permeable bed of a non-porous solid material which has a large surface area in relation to the bed volume to collect necessary chloride thereon and thereafter recovering the mercury by either washing the bed with chlorine containing brine and passing the resulting mercury-containing brine to an electrolysis cell with a mercury cathode or dissolving the bed material in an aqueous process stream and passing the stream to an electrolysis cell with a mercury cathode.