The attempt at preparing a condensation product from sodium-m-hydroxybenzoate by means of formaldehyde and bisulphite is worthy of attention.
Among reducing agents which can be used for bleaching furs are sulphurous acid, and its salts such as sodium bisulphite and sodium sulphite; hydrosulphites, and derivatives.
The bleaching agent can be prepared by adding zinc dust to commercial bisulphite of soda dissolved in about four times its weight of water until no more reaction is evident.
They are then rinsed with a hose, and after draining, again dipped into another solution containing one per cent of bisulphite of lime; after the nuts have assumed the desired tint, they are again rinsed with water and then dried.
The cost of fifty gallons of chlorine dip will be about forty cents; the same bulk of the bisulphite dip, probably considerably less.
Inveterate cases may often be benefited by a course of sulphur, bisulphite of soda, or arsenic.
If from bed sores or other causes septicemia or pyemia is feared, the bisulphite of soda, in half-ounce doses, may be given in conjunction with tonics and such other treatment as is indicated in these diseases.
Sulphurous acid may either be applied in the gaseous form or in solution as bisulphite of soda.
Wool may also be bleached by steeping in a fairly strong solution of bisulphite of soda and then washing well in water.
Wool bleached with sulphurous acid or bisulphite is readily affected by alkalis, the natural yellow colour returning on washing with soap or soda.
Alizarin blue S is the soluble sodiumbisulphite compound of alizarin blue; it corresponds, therefore, to the above-mentioned coerulein S, and in its application the same precautions as to the temperature of the dyebath are necessary.
Coerulein S is the more soluble bisulphitecompound of the ordinary coerulein.
With sodium bisulphite they form the so-called bisulphite compounds R.
Dissolve together in 14 pints of distilled or rain water:--Bisulphite of soda, 7 oz.
Sulphite or bisulphite of soda apparently occasions some pain, as the animals struggle very much; with carbolic acid I found them tolerably quiet.
Bisulphite of lime has, within the last few years, been highly recommended for sweetening and cleaning vats, casks, &c.
On this reaction the following proceedings for dyeing and printing with indigo are founded:--To prepare the reducing liquid, a solution of bisulphite of soda at 35 deg.
The sulphite is redissolved as bisulphite by treatment with sulphurous acid.
Assuming the present necessity of a destructive treatment of the by-products of the bisulphite processes, the scheme has many advantages.
The bisulphite processes depended in the earlier stages upon the efficiency of lead-lined digesters.
As a last point it must be considered that as chemists we are bound to anticipate the realisation of value in the soluble by-products of the bisulphite processes.
A lead-lined digester is necessary, and the solution employed is bisulphite of lime prepared according to the directions given on page 160.
For experimental purposes the bisulphite of lime solution may be prepared by passing sulphurous acid gas into a mixture of water and sulphite of lime.
This is generally known as a solution of bisulphite of lime.
A compound prepared from the waste liquors of the bisulphite process used for the manufacture of wood pulp.
If the bisulphite causes no bleaching, boil a piece of the paper with very dilute hydrochloric acid.
The process most generally adopted for the manufacture of wood pulp is the treatment of the material in brick-lined digesters with bisulphite of lime for eight to nine hours at a pressure of 80 lbs.
The hot sulphurous acid gas passes through pipes and is cooled, after which it is brought into contact with water and lime for the production of the bisulphite of lime.
A similar investigation should be made by submitting the fibre to treatment with bisulphite of lime, that is to say, if the fibre lends itself to such a process.
The gas is forced into the tanks by pressure or drawn through by suction, and the conversion of the milk of lime into bisulphite of lime proceeds automatically.
In the preparation of this vat, which was devised by Schutzenberger and Lalande, bisulphite of soda and zinc dust are used with either quick-lime or caustic soda.
The bisulphite of soda is allowed to act on the zinc as will be detailed when an acid solution of sodium hydrosulphite NaHSO{2}, more strictly hydrogen sodium hydrosulphite, is obtained.
To this is then added 1 gallon of either hydrosulphite or bisulphite of soda to destroy the free oxygen it contains, and prevent it from oxidising the indigo solution, which is next added.
In some cases hydrosulphite has proved a useful reducing agent; it can be easily prepared from ordinary bisulphite of soda in the following manner.
The cyanide and bisulphitesolution is then added with warming till the blue colour is destroyed.
This usually requires the exact amount of cyanide and bisulphite mentioned, but I have not found it essential to entirely destroy the colour.
Solid bisulphite may be used, but it is usually dear, and solutions are more commonly employed.
Bisulphite of soda has also often been used as the reducing agent.
Sometimes a mixture of bisulphite and powdered zinc replaces it, but this is objectionable for pure food gelatines.
By solubilizing quebracho with excess of bisulphite an extract is obtained which possesses considerable bleaching powers, and such extracts are also extensively manufactured for the "vatting" or bleaching of heavy leather after tannage.
The solution of sodium bisulphite should be poured into the latex in as uniform a distribution as possible.
The anti-oxidant effect of sodium bisulphite and sodium sulphite is due to the liberation of the gas, sulphur dioxide.
Unless stirring is thorough it is possible that portions of the latex would not be in contact with sodium bisulphite while others receive more than a fair share.
On some estates the ingredients of this compound crepe, while fresh, are placed in a common jar or tank to which a quantity of sodium bisulphite (1 per cent.
There appears to be an idea held in some quarters that sodium bisulphite may be so employed as a fungicide.
To prevent the oxidation of the rubber in actual practice, the freshly prepared crepe is soaked in a solution of sodium bisulphite before hanging to dry.
To remedy this defect the freshly prepared crepe is soaked in a solution of sodiumbisulphite and sulphuric acid.
One is thus assured that the prescribed quantities of sodium bisulphite will meet requirements in every case, and that waste will be avoided.
A solution of sodium bisulphite is heavier than latex, and there would be a tendency, therefore, for the chemical to sink in the large mixing jar.
Finally it may be insisted upon that deteriorated sodiumbisulphite should not be used.
Sodium bisulphite and sodium sulphite are both bought for our purpose in the form of a fine crystalline powder, and on analysis good specimens should contain over 90 per cent.
On the whole, therefore, the presence of sulphate in crepe rubber is adventitious, and properly washed crepe prepared with moderate quantities of bisulphite may be taken as free from any residual quantities.
The pieces are then machined into crepe form, but as no sodium bisulphite may have been used, the resulting rubber cannot be classed as No.
When zinc dust and bisulphite of soda are mixed together a reaction sets in, the zinc dissolves, and there is formed sodium hydrosulphite and zinc and sodium sulphites.
After a day's work it is well to add a little of the zinc and bisulphite mixture, to stir well and allow to stand overnight; the next morning strengthen up the vat by adding fresh stock liquor.
Such substances are the bisulphites, if used with the bisulphite compounds of the dye-stuffs; the acetates, if mixed with some acetic acid, may also be used.
The oil consists almost entirely of citronellic aldehyde, and on absorption with saturated solution of sodium bisulphite should leave very little oil unabsorbed.
In the estimation of these substances, use is made of their property of combining with sodium bisulphite to form compounds soluble in hot water.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "bisulphite" in a variety of sentences. We hope that you will now be able to make sentences using this word.
