JPH0153916B2 - - Google Patents
Info
- Publication number
- JPH0153916B2 JPH0153916B2 JP57101340A JP10134082A JPH0153916B2 JP H0153916 B2 JPH0153916 B2 JP H0153916B2 JP 57101340 A JP57101340 A JP 57101340A JP 10134082 A JP10134082 A JP 10134082A JP H0153916 B2 JPH0153916 B2 JP H0153916B2
- Authority
- JP
- Japan
- Prior art keywords
- methanol
- viscosity
- lithium bromide
- lithium
- solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Sorption Type Refrigeration Machines (AREA)
Description
【発明の詳細な説明】
この発明は、低温吸収式冷凍機に用いる吸収液
に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an absorption liquid used in a low temperature absorption refrigerator.
従来、此種吸収液としては臭化リチウム水溶液
が理想的な溶液として広く用いられている。しか
し、この吸収液は水を冷媒とするため氷点以下の
低温領域の冷水を取出すのが困難である。これに
対し、アルコールは０℃以下の冷却液を取出せる
ため、低温吸収式冷凍機用の冷媒として優れた効
果を示し、一般的には臭化リチウム水溶液に似た
組成のメタノール−臭化リチウム系溶液を用いる
ことが提案されている。 Conventionally, an aqueous lithium bromide solution has been widely used as an ideal solution for this kind of absorption liquid. However, since this absorption liquid uses water as a refrigerant, it is difficult to extract cold water in a low temperature range below the freezing point. On the other hand, alcohol has an excellent effect as a refrigerant for low-temperature absorption refrigerators because it can extract coolant at temperatures below 0°C, and is generally used as a methanol-lithium bromide solution with a composition similar to an aqueous lithium bromide solution. It has been proposed to use a system solution.
しかし、メタノール−臭化リチウム系溶液は第
１図に示すように濃度が40重量％付近で粘度が急
激に高くなる。これは系内において臭素１モルと
メタノール４モルとの間に弱い水素結合
（LiBr・4CH3OH）が生じ、更にメタノールのメ
チル基が相互に作用するためと考えられ、臭化リ
チウム水溶液と比べ非常に高い粘度を示す。その
結果、メタノール−臭化リチウム系溶液では次の
ような問題が生じる。 However, as shown in FIG. 1, the viscosity of methanol-lithium bromide solutions increases rapidly when the concentration is around 40% by weight. This is thought to be due to the formation of weak hydrogen bonds (LiBr・4CH 3 OH) between 1 mole of bromine and 4 moles of methanol in the system, and the interaction of the methyl groups of methanol. Exhibits very high viscosity. As a result, the following problems arise with methanol-lithium bromide solutions.
１ 溶液循環ポンプに対する負荷が大きいため、
その性能及び寿命に悪影響を及ぼし、設備費や
電力費が増大する。1. Due to the large load on the solution circulation pump,
Its performance and lifespan are adversely affected, and equipment and power costs increase.
２ 吸収液の伝熱管に対する濡れ性が劣り、熱効
率が低下する。2. The wettability of the absorption liquid to the heat transfer tube is poor, and the thermal efficiency is reduced.
３ 吸収液表面の拡散性が悪く、吸収能力の低下
につながる。3. Diffusivity of the absorption liquid surface is poor, leading to a decrease in absorption capacity.
４ 吸収能力低下により、冷凍サイクルの効率が
悪くなる。4 The efficiency of the refrigeration cycle deteriorates due to the decrease in absorption capacity.
本発明者等は上記問題点に鑑みて研究を重ねた
結果、メタノール−臭化リチウム系溶液にヨウ化
リチウムを添加し、その臭化リチウムに対する添
加割合を増加するにつれて粘度の低下が著しくな
り、メタノール−ヨウ化リチウムの二成分系溶液
では粘度が最も低くなることを見い出し、本発明
に至つた。 As a result of repeated research in view of the above problems, the present inventors added lithium iodide to a methanol-lithium bromide solution, and as the ratio of addition to lithium bromide increased, the viscosity decreased significantly. It was discovered that a binary solution of methanol and lithium iodide has the lowest viscosity, leading to the present invention.
即ち、この発明はメタノールを冷媒として、こ
れにヨウ化リチウムを主体とする吸収剤を添加し
て成ることを特徴とするものである。 That is, the present invention is characterized in that methanol is used as a refrigerant and an absorbent mainly composed of lithium iodide is added thereto.
メタノール−臭化リチウム系溶液の粘度がヨウ
化リチウムの添加によつて低下するのは、これを
構成するカチオンとしてのLi+およびアニオンと
してI-が何れも電荷密度の小さい大型イオンであ
つて、上記水素結合（LiBr・4CH3OH）を破壊
するためと考えられる。 The reason why the viscosity of a methanol-lithium bromide solution is reduced by the addition of lithium iodide is that Li + as a cation and I - as an anion are both large ions with a small charge density. This is thought to be due to the destruction of the above hydrogen bond (LiBr・4CH 3 OH).
第２図はメタノール−臭化リチウム系溶液にヨ
ウ化リチウムを添加し、臭化リチウムに対するヨ
ウ化リチウムの添加量（重量％）を増加させたと
きの20℃における濃度と粘度の関係を示すグラフ
である。濃度はメタノール100ｇに対する臭化リ
チウムとヨウ化リチウムとの溶解量（ｇ）で示
す。 Figure 2 is a graph showing the relationship between concentration and viscosity at 20°C when lithium iodide is added to a methanol-lithium bromide solution and the amount (wt%) of lithium iodide relative to lithium bromide is increased. It is. The concentration is expressed as the amount (g) of lithium bromide and lithium iodide dissolved in 100 g of methanol.
図から明らかなように、メタノール−臭化リチ
ウム系溶液にヨウ化リチウムを添加すると、その
粘度は添加割合の増加と共に著しく低下する。即
ち、ヨウ化リチウムと臭化リチウムを１：１（重
量比）とすると、その粘度は濃度60％において約
90％の低下が見られ。そして臭化リチウムの存在
しないメタノール−ヨウ化リチウムの二成分系溶
液では95％も低下する。 As is clear from the figure, when lithium iodide is added to a methanol-lithium bromide solution, its viscosity decreases significantly as the addition ratio increases. In other words, when lithium iodide and lithium bromide are used in a 1:1 (weight ratio), the viscosity is approximately 60%.
A 90% decrease was observed. In a binary solution of methanol and lithium iodide, which does not contain lithium bromide, it decreases by 95%.
即ち、この発明によれば従来の臭化リチウムに
代えて、メタノール冷媒に対し吸収剤としてヨウ
化リチウムを使用することにより粘度の極めて低
い吸収液が得られる。この吸収液の粘度は、メタ
ノールに対するヨウ化リチウムの濃度を変えるこ
とによつて、またヨウ化リチウムに対して臭化リ
チウムを添加することにより所望の値に調整する
ことができる。 That is, according to the present invention, an absorbent liquid with extremely low viscosity can be obtained by using lithium iodide as an absorbent for methanol refrigerant in place of the conventional lithium bromide. The viscosity of this absorption liquid can be adjusted to a desired value by changing the concentration of lithium iodide relative to methanol or by adding lithium bromide to lithium iodide.
第３図はメタノール−臭化リチウム−ヨウ化リ
チウム系溶液の蒸気圧を示し、直線１，２〜９は
それぞれ第２図の曲線１，２〜９に対応する。ま
た、これらの溶液は吸収剤の濃度がすべて60重量
％のもので、メタノールに対する飽和濃度と考え
られる。図から明らかなように、メタノール−ヨ
ウ化リチウム系溶液の蒸気圧が一番高く、ヨウ化
リチウムに対する臭化リチウムの添加量を減らす
とメタノール−臭化リチウムの二成分系溶液とほ
ぼ等しくなる。 FIG. 3 shows the vapor pressure of a methanol-lithium bromide-lithium iodide solution, and straight lines 1 and 2 to 9 correspond to curves 1 and 2 to 9 in FIG. 2, respectively. In addition, all of these solutions had an absorbent concentration of 60% by weight, which is considered to be a saturated concentration with respect to methanol. As is clear from the figure, the vapor pressure of the methanol-lithium iodide solution is the highest, and when the amount of lithium bromide added to lithium iodide is reduced, it becomes almost equal to the methanol-lithium bromide binary solution.
この発明は以上説明したように、メタノール冷
媒にヨウ化リチウムを主体とする吸収剤を添加す
ることにより従来のメタノール−臭化リチウム系
溶液に比較して極めて粘度の低い吸収液を提供す
ることができ、次のような効果が得られる。 As explained above, this invention is capable of providing an absorbing liquid with an extremely low viscosity compared to conventional methanol-lithium bromide solutions by adding an absorbent mainly composed of lithium iodide to a methanol refrigerant. You can achieve the following effects:
１ 吸収液の粘度低下により、伝熱管上への濡れ
性が向上し、熱効率が上がる。1. Lowering the viscosity of the absorbing liquid improves its wettability onto the heat transfer tube, increasing thermal efficiency.
２ 粘度低下により、溶液循環ポンプにかかる負
荷が低減し、その性能や寿命が向上する。2. Lower viscosity reduces the load on the solution circulation pump, improving its performance and lifespan.
３ 吸収液の拡散性が向上し、メタノールに対す
る系の吸収能力が増大し、これによつて冷凍サ
イクルの効率がよくなる。3. The diffusivity of the absorption liquid is improved and the absorption capacity of the system for methanol is increased, thereby increasing the efficiency of the refrigeration cycle.
４ また、吸収式ヒートポンプ用の吸収液として
も用いることができる。4 It can also be used as an absorption liquid for absorption heat pumps.
第１図は従来のメタノール−臭化リチウム系溶
液の濃度と粘度の関係を示すグラフ、第２図はこ
の発明に係る吸収液の20℃における濃度と粘度の
関係を示すグラフ、第３図は同じく蒸気圧線図で
ある。
Figure 1 is a graph showing the relationship between concentration and viscosity of a conventional methanol-lithium bromide solution, Figure 2 is a graph showing the relationship between concentration and viscosity at 20°C of the absorbent according to the present invention, and Figure 3 is a graph showing the relationship between concentration and viscosity of the absorbent according to the present invention. It is also a vapor pressure diagram.
Claims (1)
ウムを主体とする吸収剤を添加して成ることを特
徴とする低温吸収式冷凍機用吸収液。1. An absorption liquid for a low-temperature absorption refrigerating machine characterized by using methanol as a refrigerant and adding an absorbent mainly composed of lithium iodide to the methanol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57101340A JPS58219937A (en) | 1982-06-15 | 1982-06-15 | Absorption liquid for low temperature absorption refrigerators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57101340A JPS58219937A (en) | 1982-06-15 | 1982-06-15 | Absorption liquid for low temperature absorption refrigerators |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58219937A JPS58219937A (en) | 1983-12-21 |
| JPH0153916B2 true JPH0153916B2 (en) | 1989-11-16 |
Family
ID=14298104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57101340A Granted JPS58219937A (en) | 1982-06-15 | 1982-06-15 | Absorption liquid for low temperature absorption refrigerators |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58219937A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61228270A (en) * | 1985-03-30 | 1986-10-11 | 清水建設株式会社 | Refrigerator for cryogenic heat source |
| DE102004024967A1 (en) * | 2004-05-21 | 2005-12-08 | Basf Ag | New absorption media for absorption heat pumps, absorption chillers and heat transformers |
| CN117267978A (en) * | 2023-10-12 | 2023-12-22 | 重庆万盛煤化有限责任公司 | A lithium bromide refrigeration chiller matched with a low-temperature methanol washing system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2224537A3 (en) * | 1974-07-26 | 1974-10-31 | Prolomag Anstalt | Refrigerant for industrial and domestic use - which is safe and inoffensive even when accidentally absorbed |
| JPS5586862A (en) * | 1978-12-25 | 1980-07-01 | Agency Of Ind Science & Technol | Coolant and absorbent for absorption refrigeration system |
-
1982
- 1982-06-15 JP JP57101340A patent/JPS58219937A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58219937A (en) | 1983-12-21 |
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