Sulphur dioxide removal from tail gas in contact process - for sulphuric acid mfr. by scrubbing with dil sulphuric acid in venturi and packed tower, for simplicity and economyThe tail gas is scrubbed with 70-80 wt.% H2SO4 in vertical venturi in parallel flow and passed through a vertical ...
Concn. of dil. sulphuric acid - using silicon-contg. cast iron film evaporator, to obtain conc. acid for reuse in chemical processesThe dil. acid(a) contains 60-80% H2SO4; and is fed down a film evaporator, made of cast iron contg. 14-17% silicon, and heated by radiation from ...
hydroxy - 4 - hydroxymethyl - 6 - methyl - pyridine - hydrochloride which has been formed by chlorinating O,O1 - cyclohexylidene - 5 - hydroxy - 3,4 - dihydroxymethyl - 6 - methyl - pyridine - hydrochloride formed from pyridoxol hydrochloride, cyclohexanone and concentrated sulphuric acid. ...
Removing magnesium cpds. from crude phosphate - by mixing phosphate with seawater and dil. sulphuric acid then filteringThe crude phosphate is sieved, crushed, and the fraction with size -0.5 mm to 30 mu m sepd. The fraction is mixed with water in the wt. ratio 1 part phosphate: 5 pts....
Removing magnesium cpds. from crude phosphate - by mixing phosphate with seawater and dil. sulphuric acid then filteringThe crude phosphate is sieved, crushed, and the fraction with size -0.5 mm to 30 mu m sepd. The fraction is mixed with water in the wt. ratio 1 part phosphate: 5 pts....
Active carbon contg. porous bodies - produced by soaking carbon and hydrogen contg. material in dil. sulphuric acid and heatingActive carbon-contg. porous bodies are produced by soaking a carbon and hydrogen-contg. material (e.g. paper) with 0.5-5% soln. of H2SO4 in water or a more vol...
process for the preparation of demiesters sulphuric acid, bis - (4 - hydroxyphenyle) - (pyridil - (2) - (4) - methane and hydroxyphenyle) - (4 - (pyridil methoxyphenyle) - (2) - methaneSEEGER,ERNST,DTMACHLEIDT,HANS,DTENGEL,WOLFGANG,DT...
Anodic oxidn. of Al, which does not require cooling of the bath, is carried out using a H2SO4 electrolyte which is diluted to a concn. of 6-25, pref. 9-12% and a c.d. of 0.005-1, pref. 0.01-0.1 A/dm2 for 60 min., depending on the c.d. The bath is pref. used with ...
Conc. sulphuric acid and/or oleum is made from impure, 30-60% waste H2SO4 (I), by (a) concentrating at 50-150 degrees C. in the presence of a gas stream (d) to obtain over 60-75 wt.% H2SO4, which is then thermally cracked to obtain gas contg. SO2; converting the SO2 ...
Container for concn. of dil. solns. of corrosive prods. - partic. concn. of sulphuric or phosphoric acid solns.Container useful for concn. in cascades of dil. soln of corrosive prodts. by heating has a downwardly curved hooked pouring lip at its lower end and at its upper end a ...