The sulphonic acid group may also be directly introduced either by concentrated, or by fuming sulphuric acid, or by elimination of halogen by the action of sodium or silver sulphite on the halogen derivatives of the aliphatic compounds.
Limestone is required in considerable quantity for the preparation of sulphite of lime for the manufacture of wood pulp.
The bright yellow mass is then washed with water and immersed in a solution of sodium sulphite (twenty grammes of sodium sulphite in 1,000 cc.
A known weight of sulphite of lime is added to a measured volume of water, and the sulphurous acid gas discharged into the mixture from a siphon of compressed sulphurous acid.
When sulphite or soda pulps are used, either separately or conjointly, in the manufacture of printing papers, the quantity of neither material shall separately exceed 50 per cent.
The conversion of wood into sulphite pulp: sulphur; limestone.
A known volume of the sulphite liquor is first titrated with standard iodine solution, the number of cubic centimetres required being a measure of the total sulphurous acid.
At the present time there is no process in general use for the recovery of the liquors used in the treatment of wood by the sulphite process.
The spent liquors from the sulphite process have no value, for they cannot be recovered by this method.
This is sulphitepulp prepared by digesting the wood at a much lower temperature and for a longer period than the ordinary sulphite.
A great deal of sodium sulphiteis used in the bleaching industry, and as a reagent for softening paper pulp.
Sodium sulphite is prepared by the action of sulphur dioxide upon solutions of sodium hydroxide, the reaction being analogous to the action of carbon dioxide upon sodium hydroxide.
Show that the preparation of sulphur dioxide from a sulphite is similar in principle to the preparation of hydrogen sulphide.
Because of this reaction sodium sulphiteis used as a convenient source of sulphur dioxide.
When a sulphite is treated with an acid, sulphurous acid is set free, and being very unstable, decomposes into water and sulphur dioxide.
A mixture of sulphite of calcium, chalk, and carbolic acid, or of sulphite and carbonate of lime.
Some concentrated decoctions have been recently offered for sale which do not contain alcohol, being preserved by the addition of sulphurous acid, or sulphite of lime.
Sulphite or bisulphite of soda apparently occasions some pain, as the animals struggle very much; with carbolic acid I found them tolerably quiet.
In the formation of paper pulp from wood two processes are employed, one known as the soda process, and the other the sulphite process.
In the sulphite process the chips are then delivered into the digesters shown in Fig.
It consists either in diffusing sulphurous acid, from burning sulphur matches in the cask containing the must, or in adding a little sulphite (not sulphate) of lime to it.
The composition of the acid was determined by boiling a certain weight of the seleniate of soda with muriatic acid in excess, and decomposing the selenious acid formed by sulphite of soda; 4.
This was gathered in a filter without contact of air, and washed with boiled water containing sulphite of ammonia in solution, and dried at 212°, in close vessels, through which a current of hydrogen was continually passed.
Generally speaking, the sulphuretted hydrogen and sodium sulphite methods are to be preferred.
To the warm solution add from 2 to 3 grams of sodium sulphite crystals.
The solution is diluted with water, and treated with a solution of sulphite of soda.
In addition, if an excess of sodium sulphite has been used and enough acid not subsequently added, the excess will count as iron.
If any chromate is present reduce it with sodium sulphite or sulphuretted hydrogen.
The sodium sulphite method has the advantages of being clean and neat, and of requiring no nitration.
Sulphite of soda, citric acid and sulphurous acid are used to keep the pyro from oxidizing.
The jute acetate showed the normal reaction with chlorine, and the lignone chloride was dissolved by treatment with sodium sulphite solution.
The lignone chloride is removed by sodium sulphite solution, and the residue is a cellulose benzoate.
The chlorinated derivative is entirely soluble in sodium sulphite solution.
The sulphitetreatment was the more marked in influence, somewhat lowering the cellulose and nitration constants.
Moreover, an investigation of the products dissolved by sodium sulphite solution from the chlorinated fibre has shown that they are practically free from furfuroids.
As a combined result of economic production and active competition, the selling prices of 'sulphite pulp' have moved steadily downwards in relation to other half-stuffs and raw materials.
The sulphite is redissolved as bisulphite by treatment with sulphurous acid.
It is purified for weighing by boiling in neutral sulphite of soda (2 p.
Paper made from the pulps of sulphite and sulphate processes is capable of yielding a very soluble pyroxyline.
These cellulose pulps are known in commerce as "sulphite pulps" and "soda pulps" respectively.
To separate the latter, purify with acid sodium sulphiteand recrystallize.
Not that the pyro developer is unsuitable, for if sufficient sulphite is used, and the quantity of pyro kept down, negatives of very beautiful quality for enlarging purposes may be produced.
A uniform stain, of a yellowish or brown colour, is produced when the pyro developer contains too small a proportion of sulphite or is allowed to act for a very long time.
Sodium sulphite and potassium metabisulphite are the most commonly used.
Instead of weighing out two grains of sulphite it is more convenient to weigh twenty grains and dissolve in two-and-a-half ounces of water--i.
It also affects the colour of the reduced silver that forms the developed image, this colour being browner, and consequently of higher printing opacity, the lower the proportion of sulphite present.
The soda pulp is shipped in rolls and the sulphite in sheets, as this is the most favorable form in which to handle them at the paper-mill.
One reason for the difference in price between soda and sulphite pulps, is that the soda is recovered from the spent liquor, whereas in the sulphite process the liquors go to waste.
When made into paper with a suitable admixture of sulphite pulp, for strength’s sake, it proves to be admirably adapted for the fast-running newspaper presses, as ink dries upon it almost instantly.
To an American belongs the credit for the important invention of the sulphite process, Benjamin C.
Sulphite pulp is produced by the use of bisulphite of lime; this, being acid, necessitates a special brick lining in the digesters, which are of the vertical type.
A special method for making sulphite pulp was invented in Germany by Professor Mitscherlich.
In the case of lime, calcium carbonate, sulphite and sulphide, all solid substances, are formed.
The only one of these salts known to the old chemists was the sulphite of potash, under the name of Stahl's sulphureous salt.
Here it is mixed with a certain amount of “sulphite pulp,” usually from 20 to 25 per cent.
The “digesters” in which the chips are boiled are large steel cylinders lined with brick set in cement and coated with litharge and glycerin, so as to prevent the sulphite liquor from coming into contact with the metal.
The superiority of sulphite pulp is due to the fact that chemical processes are used to remove these disturbing ingredients, leaving only the “bones” of the tree, that is, the pure cellulose fiber.
The sulphite liquor in which the resinous matter is dissolved is drained away and the pulp is washed.
Then it goes to the beater where it receives its quota of sulphite pulp, coloring matter, clay, and sizing, as explained before.
The fermentation of syrups may be effectually prevented by the addition of a little sulphite of potassa or of limes.
Berkeley recommended the use of sulphite of soda with pyrogallic acid to prevent discolouration of film.
By reaction with sodium sulphite it is converted into a hydroquinone sulphonate of deep purple colour.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "sulphite" in a variety of sentences. We hope that you will now be able to make sentences using this word.
