Patent GB-459420-A (GB)
Title: A process for the preparation of steel picklings inhibitors
IPC: C23G1/06
Filed: 1936-03-19
Abstract: <PICT:0459420/IV/1> A process for the manufacture of a steel pickling inhibitor from the oily product obtained by neutralizing petroleum acid sludge comprises adding alkali, e.g. ammonia, to the sludge, removing the resulting alkali extract, adding acid, e.g. sulphuric acid, with or without an alkali metal salt or an ammonium salt, to the remaining oil, removing the acid extract produced, mixing the two extracts, and removing the resulting upperlayer which forms the inhibitor.  The product may be purified by adding water, removing the upper layer, and salting out the inhibitor therefrom, e.g. by adding ammonium sulphate.  In carrying out the process, neutralized sludge and water are introduced into an agitator 1 through pipes 2 and 4 respectively, and ammonia gas is admitted through a pipe 6, the contents of the agitator being circulated by a pump 8 through pipes 9, 9<a>; the resulting ammoniacal extract is pumped from the bottom of the agitator 1 into an agitator 7.  Sulphuric acid and ammonium sulphate from pipe 11 are added to the residual oily matter in the agitator 1 and the mixture circulated, the resulting acid extract containing nitrogen bases being pumped into the agitator 7, and the remaining oily matter being run into a tank 13 and used as fuel.  The two extracts in the agitator 7 are mixed by a stirrer 16, the inhibitor forming an upper layer on a layer of nitrogen bases in sulphuric acid and ammonium sulphate which is drained into a tank 17. The inhibitor is purified by mixing with water from the pipe 4, draining away the lower layer, and pumping the upper layer into an agitator 24 where it is mixed with ammonium sulphate from an elevator 28.  The purified inhibitor rises to the top of the ammonium sulphate solution, which is run off to a tank 30 communicating through a pump 36 and pipe 37 with the pipe 11, and the inhibitor is run into a tank 34.ALSO:A process for the manufacture of a steel pickling inhibitor from the oily product obtained by neutralizing petroleum acid sludge comprises adding alkali, e.g. ammonia, to the sludge removing the resulting alkali extract, addin <PICT:0459420/III/1> acid, e.g. sulphuric acid with or without an alkali metal salt or an ammonium salt, to the remaining oil, removing the acid extract produced, mixing the two extracts, and removing the resulting upper layer which forms the inhibitor.  The product may be purified by adding water, removing the upper layer, and salting out the inhibitor therefrom, e.g. by adding ammonium sulphate. In carrying out the process, neutralized sludge and water are introduced into an agitator 1 through pipes 2 and 4 respectively, and ammonia gas is admitted through a pipe 6, the contents of the agitator being circulated by a pump 8 through pipes 9, 9<a>; the resulting ammoniacal extract is pumped from the bottom of the agitator 1 into an agitator 7. Sulphuric acid and ammonium sulphate from pipe 11 are added to the residual oily matter in the agitator 1 and the mixture circulated, the resulting acid extract containing nitrogen bases being pumped into the agitator 7, and the remaining oily matter being run into a tank 13 and used as fuel.  The two extracts in the agitator 7 are mixed by a stirrer 16, the inhibitor forming an upper layer on a layer of nitrogen bases in sulphuric acid and ammonium sulphate which is drained into a tank 17.  The inhibitor is purified by mixing with water from the pipe 4, draining away the lower layer, and pumping the upper layer into an agitator 24 where it is mixed with ammonium sulphate from an elevator 28.  The purified inhibitor rises to the top of the ammonium sulphate solution, which is run off to a tank 30 communicating through a pump 36 and pipe 37 with the pipe 11, and the inhibitor is run into a tank 34.  According to the Specification as open to inspection under Sect. 91, the inhibitor may be used as an insecticide.  This subject-matter does not appear in the Specification as accepted.ALSO:A process for the manufacture of a steel-pickling inhibitor which, according to the Specification as open to inspection under Sect. 91, may be used as an insecticide, from the oily product obtained by neutralizing petroleum acid sludge, comprises adding alkali, e.g. ammonia, to the sludge, removing the resulting alkali extract, adding acid, e.g. sulphuric acid with or without an alkali metal salt or an ammonium salt, to the remaining oil, removing the acid extract produced, mixing the two extracts, and removing the resulting upper layer which forms the inhibitor. The product may be purified by adding water, removing the upper layer, and salting out the inhibitor therefrom, e.g. by adding ammonium sulphate.  The reference to insecticides does not appear in the Specification as accepted.