Caustic soda, liquid

Reducing agents Caustic soda, liquid 50%, low iron 255-285/t... 

CAUSTIC SODA, GRANULAR CAUSTIC SODA, LIQUID CAUSTIC SODA, SOLID CAUSTIC SODA, SOLUTION LEWIS-RED DEVIL LYE LYE SODALYE SODIUM HYDRATE SODIUM HYDROXIDE, BEAD SODIUM HYDROXIDE, DRY SODIUM HYDROXIDE, FLAKE SODIUM HYDROXIDE, GRANULAR SODIUM HYDROXIDE, SOLID WHITE CAUSTIC... 

Caustic soda, liquid Cedar leal oil U.S.P. XIII Chloroform Chlorothymol N.F Cinchonidine... 

Wuhan Gehua Group Co Ltd is one of the 520 national key enterprises in China with total assets of 2000 million yuan and 8000+ employees. It is also the largest producer of basic chemical materials in the Mid-China region. In addition to caustic soda, liquid chlorine, carbon black, chlorobenzene, sodium benzoate, sodium tripolyphosphate and sulphuric acid it also produces 60 000 tonnes per year of PVC (including resin and PVC paste). 

Liquids. Some Hquid dyes are made directly from the thionation melt by additions of caustic soda and sodium hydrosulfide. Hydrotropic substances are sometimes added, either at the initial thionation stage or after the polysulfide melt is finished in order to keep the reduced dye in solution. Pardy reduced Hquids are also available. They are usually more concentrated than fully reduced Hquids, thus saving packaging and transportation costs. However, they require a further addition of reducing agent to the dyebath in order to obtain full color value. On the other hand, fully reduced Hquids are... 

Some liquids like caustic soda can crystallize with additional heat. 

In the case of decomposition of the water - when a small amount of water is found in either a gas or a liquid, it may be removed by decomposing it and separating the products formed. For example, ether can be dried by placing it in contact with metallic sodium. In the reaction, caustic soda is formed, which clings to the surface... 

Health Hazards Information - Recommended Personal Protective Equipment Maximum protective clothing goggles and face shield Symptoms Following Exposure Severe bums caused by burning metal or by caustic soda formed by reaction with moisture on skin General Treatment for Exposure SKIN brush off any metal, then flood with water for at least 15 min. treat as heat or caustic bum call a doctor Toxicity by Inhalation (Ihreshold limit Value) Not pertinent Short-Term Exposure Limits Not pertinent Toxicity by Ingestion Not pertinent Late Toxicity None Vtqtor (Gas) Irritant Characteristics Non-volatile Liquid or lid Irritant Characteristics Severe skin irritant. Cause second- and third-degree burns on short contact and is very injurious to the eyes Odor Threshold Not pertinent. 

Anhydrous caustic soda (NaOH) is available but its use is generally not considered practical in water and wastewater treatment applications. Consequently, only liquid caustic soda is discussed here. Liquid caustic soda is generally shipped at two concentrations, 50 percent and 73 percent NaOH. The densities of the solutions as shipped are 12.76 Ib/gal for the 50 percent solution and 14.18 Ib/gal for the 73 percent solution. These solutions contain 6.38 Ib/gal NaOH and 10.34 Ib/gal NaOH, respectively. The crystallization temperature is 53 F for the 50 percent solution and 165 F for the 73 percent solution. The molecular weight of NaOH is 40. The pH of a 1 percent solution of caustic soda is 12.9. 

Storage tanks for liquid caustic soda should be provided with an air vent for gravity flow. The storage capacity should be equal to 1.5 times the largest expected delivery, with an allowance for dilution water, if used, or two-weeks supply at the anticipated feed rate, whichever is greater. Tanks for storing 50 percent solution... 

The first vessel in the blowdown system is therefore an acid-hydrocarbon separator. This drum is provided with a pump to transfer disengaged acid to the spent acid tank. Disengaged liquid hydrocarbon is preferably pumped back to the process, or to slop storage or a regular non-condensible lowdown drum. The vented vapor stream from the acid-hydrocarbon separator is bubbled through a layer of caustic soda solution in a neutralizing drum and is then routed to the flare header. To avoid corrosion in the special acid blowdown system, no releases which may contain water or alkaline solutions are routed into it. 

After the apparatus has been fitted together the caustic soda solution is run in slowly and the flask shaken. The liquid is no more ammonia is evolved be ascertained by testing a drop litmus paper. If the operation is titrated with half-normal sodium methyl orange as indicator. 

Boil another portion of the acid with caustic soda and let it cool. Pour off the liquid from the crust of sodium palmitate, which forms on the surface, wash once or twice with... 

Boil the tartaric acid and caustic soda solution for three hours in a round flask (I litre), or preferably in a tin bottle furnished with reflu. condenser. The use of a tin vessel obviates certain clitli-cultiesof filtration which the solution of the silica by the action of the alkali on the glass entails. The liquid, after boilinjg, is carefully neutralised with cone, hydrochloric acid (it is acl is-able to remove a little of the solution beforehand in case overshooting the mark) and an excess of calcium chloride solution is added to the hot liquid. The mixture is left overni hl. and the calcium salts filtered off at the pump, washed with water, and well pressed. 

Dissolve 6 grams of caustic soda in 250 c.c. of water und heat to boiling. Add 5 grams of the hydrochloride of nitroso-dimethylanilinegradually. The free base, which separates out in oily drops, is allorved to dissolve before each fresh addition. The boiling is continued until the dark gieen colour of the liquid... 

Reaction.—Make a solution of 4 grams stannous chloride in TO c.c. cone, hydrochloric acid, add 2 grams aminoazobenzene, and boil for a few minutes. On cooling ciystals of the hydrochlorides of aniline and yi-phenylenediamine separate out. The liquid is filtered and washed with a little cone, hydrochloric acid to remove the tin salts. If the precipitate is dissolved in water and made alkaline with caustic soda, a mixture of liquid aniline and solid/-phenylenediamine is precipitated, from which the former may be removed by filtering, washing, and draining on a porous plate. 

The sulphanilic acid is dissolved in the sodium carbonate (i mol.) solution and the sodium nitrite (i mol.) solution added. The mixture is cooled in ice, and the solution of hydrochloi ic acid (i mol.) gradually added. The solution of dimethylaniline (i mol.) is now poured in, and the liquid made alkaline with caustic soda. The separation of methyl orange at once begins, and is assisted by the addition of a little common salt (20 grams). The precipitate is filtered at the pump, and crystallised from hot water. Yield, nearly theoretical. 

Add 2 c.c. absolute alcohol to i c.c. sulphonic chloride and excess of caustic soda until alkaline warm gently for fire minutes and add more caustic soda if necessary. Cool, and extract with ether. The residual liquid consists of benzene ethyl sulphonate, CoH SOjCl + HOC Hj = CcH SOoOC H -p HCl. 

Add picric, acid ind i few drops of caustic soda to a dilute solution of grape suga c, md warm. I he liquid turns deep brown. 

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