JPH0625639B2 - Absorption liquid - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an absorbing liquid, and more specifically, a refrigerant vapor used in a system such as an absorption heat pump that uses water as a refrigerant, an absorption refrigerator and an absorption chiller-heater. An absorption liquid that absorbs (hereinafter referred to as an absorption liquid).

[Conventional technology]

In systems such as absorption heat pumps, absorption refrigerators, and absorption chiller-heaters that use water as a refrigerant, refrigerant vapor (water vapor) is absorbed by an absorbing liquid, and latent heat generated at that time and chemicals caused by changes in the concentration of the absorbing liquid. Energy is generated by utilizing the difference in potential. Although various substances have been used as the absorbing liquid in the system as described above, the most widely used at present is an aqueous solution of an inorganic salt such as lithium bromide.

This aqueous solution of lithium bromide is an excellent absorbent that has a large absorption capacity for water and has a large heat of dilution, but since it has considerably severe corrosiveness, it is necessary to consider corrosion protection against the metal used in the system equipment. There was a big drawback.

[Problems to be solved by the invention]

It is an object of the present invention to provide a novel absorption liquid excellent in anticorrosion property, which overcomes the disadvantage of strong corrosiveness to metals of the absorption liquid composed of a conventionally known aqueous solution of an inorganic salt such as lithium bromide.

[Means for solving problems]

As a result of repeated studies to achieve the above object, the present inventors have found that when a liquid containing a sulfoxide having a specific structure as a main component is used as an absorbing liquid, there is no problem in miscibility with water. The present invention has been completed by discovering that it produces a large amount of heat generated by mixing with water and is excellent in corrosion resistance against metals.

That is, the present invention has the general formula [In the formula, R and R ′ may be the same or different,
And a sulfoxide represented by the formula (1) each of which represents an alkyl group or an alkenyl group having 10 or less carbon atoms.

Hereinafter, the content of the present invention will be described in more detail.

The main component of the absorbent of the present invention is represented by the general formula Is the sulfoxide represented. In the formula, R and R'may be the same or different and each represents an alkyl group or an alkenyl group having 10 or less carbon atoms. R in the formula
Specific examples of R and R ′ include a methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, vinyl group, propenyl group, butenyl group. , Pentenyl group, hexenyl group, heptenyl group, octenyl group, nonenyl group, decenyl group and the like, among them, among them,
An alkyl group having 1 to 7 carbon atoms, specifically, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, and a heptyl group are preferable. Particularly preferred as components of the present invention are specifically dimethylsulfoxide, diethylsulfoxide, methylethylsulfoxide, methylpropylsulfoxide, diheptylsulfoxide and mixtures thereof.

Although the absorbent of the present invention contains the above sulfoxide as a main component,
Its content is 50 to 100% by weight, based on the total amount of absorbing liquid,
It preferably contains 70 to 100% by weight. When the content of sulfoxide is less than 50% by weight, the water absorption performance of the absorbing liquid is deteriorated, which is not preferable.

The absorbing solution of the present invention shows excellent performance even when the above sulfoxide is used alone, but it may be mixed with 50% water as necessary.
You may contain less than weight%. Furthermore, in order to further improve its anticorrosion performance, if necessary, chromate, thiocyanate, nitrite, molybdate, tungstate,
Inorganic anticorrosives such as phosphates, polyphosphates, silicates, chlorates, borates, carbonates, bicarbonates, benzoic acid,
Stearic acid, alkyl succinic acid, alkenyl succinic acid, phthalic acid, hydroxy fatty acid, mercapto fatty acid,
Sarcosine derivatives and carboxylic acids and their salts, sulfonates such as petroleum sulfonate, dinonylnaphthalene sulfonate, carboxylic acid partial esters of polyhydric alcohols such as sorbitan monooleate, pentaerythritol monooleate, carbon number 20 or less lower aliphatic amines,
Amines such as diethanolamine, cyclohexylamine and morpholine, phosphoric acid monoesters, phosphoric acid diesters, phosphorous acid monoesters, phosphoric acid esters such as phosphorous acid diesters, phosphorous acid esters and salts thereof, benzotriazole, methylbenzotriazole, etc. An organic anticorrosive such as azoles and salts thereof, thiazoles such as mercaptobenzothiazole and salts thereof may be blended, and other antifoaming agents, bactericides, chelating agents and the like may be blended. The blending amount of these various additives is arbitrary, but the total content is usually 10% by weight based on the total amount of the absorbing liquid.
It is preferable to add the following amounts.

The absorbing liquid of the present invention is preferably used in a system such as an absorption heat pump that uses water as a refrigerant, an absorption refrigerator, and an absorption chiller-heater.

〔Example〕

Hereinafter, the content of the present invention will be described more specifically by way of examples.

Example 1 and Comparative Example 1 Heat source water of 50 ° C. was obtained and cold water of 10 ° C. (5,000 kcal / hr) and 80 ° C.
In an absorption chiller-heater that simultaneously obtains hot water (8,000 kcal / hr) of 400 kg of dimethyl sulfoxide alone as an absorbing liquid (Example 1) and 400 kg of 50 wt% lithium bromide aqueous solution The coefficient of performance COP of (Comparative Example 1) was measured and is shown below. The coefficient of performance COP is a value expressed by the following formula, and indicates the energy efficiency of the system.

Further, in order to examine the corrosiveness of the absorbents of Example 1 and Comparative Example 1, the following corrosion test was conducted. That is, a cold-rolled steel sheet (length 8 cm x width 6 cm x thickness 1 mm) specified in JIS G 3141 is soaked in both solutions for 7 days, then the solution is filtered with a glass filter (GB100R), and a glass filter is used. The mass of captured rust was compared. The results are shown below.

[Effects of the Invention] As is clear from the results of Examples and Comparative Examples, the absorbing solution of the present invention exhibits energy efficiency equal to or higher than that of a conventionally known aqueous solution of lithium bromide, and is more metallic than the aqueous solution of lithium bromide. It also has the excellent performance of being extremely less corrosive to.

Claims (1)

[Claims] 1. A general formula An absorbing liquid containing a sulfoxide represented by as a main component.