TW495546B - Heat transfer fluids - Google Patents

Abstract

A heat transfer fluid having high heat capacity, high thermal loading capacity, low viscosity and low freezing point includes diphenyl oxide and 1,1 diphenyl ethane in broad proportions.

Description

Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 495546 A7 B7_ V. Description of the invention (1) The scope of the invention The heat transfer fluid (sometimes referred to as the heat transfer medium) is used to cool and heat pipes and heat recovery units. Heat agent. They can have other uses, so they are expected or expected to have high heat transfer, high heat load, and sufficient thermal stability within the operating range. It is also desirable to have fluids that can tolerate very high heat and low freezing points and maintain inertness. BACKGROUND OF THE INVENTION In the prior art, heat transfer fluids have some suitable properties at high and low temperatures and are chemically inert. A eutectic mixture of 73% diphenyl ether and 27% biphenyl, commonly known as Dowtherm A, is one of the most commonly used heat transfer fluids currently sold throughout the world. Another widely used fluid is a mixture of hydrogenated terphenyl and ditetraphenyl and dibenzyltoluene. However, there are a number of reasons to hope that the heat transfer fluids previously used for many reasons will be discontinued, and one of the reasons is that EPA now requires that biphenyls be discontinued. It is also desirable to be able to propose heat transfer fluids with higher heat resistance, lower freezing temperatures, or both. The object of the present invention is to overcome any disadvantages of previous heat transfer fluids and to no longer use biphenyls in accordance with EPA regulations. Another object of the present invention is to propose a heat transfer fluid that is more useful in the range of considering heat and freezing point, and to manufacture a heat transfer fluid that is more stable under various conditions. In order to achieve the purpose of the present invention, it is found that the structural formula is C6H50〇C6H5 wood paper standard applicable to China National Standard (CNS) A4 specifications (21G X 297 mm) --- ---; ------- Order L ------- ^ 9. (Please read the precautions on the back before filling this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 495546 Α7 Β7 V. Description of the invention ( 2) The ratio of diphenyl ether (DP〇) and diphenylethane (D Ρ Ε) having a structural formula of CH 3 CH (C 6 'H 5) 2 varies widely, but diphenyl ether or 1' 1-1 The amount of diphenylethane is relatively large or a mixture of diphenyl ether and 1,1-diphenylethane is substantially the same. In other words, a fluid having a greater amount of 1,1 ^ diphenylethane than diphenyl ether or vice versa provides a useful heat transfer fluid. However, the preferred ratio is about 5 to 50% of 1,1 diphenylethane: 95-50% of diphenyl ether provides a heat transfer fluid with significantly improved properties compared to fluids of the prior art, ie, heat transfer Fluid with higher coefficient, lower freezing point and better thermal stability. Although the foregoing composition is similar to the composition previously proposed, the previous technology did not mention this composition, the former is not used here, and as mentioned, this composition is better than the previous Many, the effects of this material are surprising and even have synergistic results. BEST MODE FOR CARRYING OUT THE INVENTION The present invention is a diphenyl ether (DPO) having a structural formula of C6H50 ° C6H5 and 1, 1-diphenylethane (D PF) having a structural formula of C Η 3 CH (C 6 Η 5) 2. E) mixture with a wide range of ratio changes. A preferred ratio is about 5 to 50% 1,1, -diphenylethane: 95-50% diphenyl ether, which provides a heat transfer fluid with a high heat transfer coefficient, a low freezing point, and high thermal stability. * Although the aforementioned mixture of 1,1-diphenylethane and diphenyl ether is a preferred embodiment of the present invention, those skilled in the art know that certain impurities and / or isomers can be added to this in small amounts. Heat transfer in the mixture without affecting the effects of the present invention is discussed in detail below. In particular, it has been ----------- installed -------- L ordered --------- ^ 9— (Please read the precautions on the back before filling this page ) This paper size is in accordance with Chinese National Standard (CNS) A4 specification (210 X 297 mm) -5- 495546 A7 ___B7__ 5. Description of the invention (3) Know XCELTHERM XT (— a kind of commercially available product, basically including '9 2 — 9 5% 1,1 diphenylethane, 7-4% 1, 2-diphenylethyl (please read the notes on the back before filling this page) and 1% diphenylmethane) can be used instead The pure 1,1-diphenylethane in the best heat transfer mixture is compared with the expected effect of the preferred embodiment of the present invention, which does not substantially affect the overall heat transfer properties of the resulting mixture. XCELTHERM XT products are processed by Radco Industries, Inc. of LaFox, Illionis, the trustee of this patent. Based on this, it has been known that a material substantially containing 1,1-diphenylethane and a small amount of other impurities and / or isomers can be used in place of pure 1,1-diphenylethane in a preferred composition. . Thermal stability tests have been performed on mixtures of 1,1-diphenylethane and diphenyl ether. However, after reviewing all the materials previously used to develop the heat transfer fluid of the present invention, it was decided to conduct a validation test to determine the heat transfer fluid complex of the present invention (diphenyl ether and 1,1-diphenylethane) New and unexpected improvements. The compounds that have been used for testing are bitriphenyl, dibenzyltoluene, diphenyl ether-biphenyl mixtures, and combinations of the present invention, and they determine which fluid provides the best heat transfer results. Here, it should be noted that the so-called `` diphenyl ether hydrazone '' and `` DPPO '' printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs in the patent application specification refer to the same chemical composition, and `` DPE 〃 means 1, 1 — diphenylethane. · Many industrial processes require the use of heat transfer fluids in a temperature range of 600-700 ° F. The heat transfer fluids used in this temperature range are divided into two categories = 1 · Liquid phase fluids, which are characterized by the vapor pressure of heat transfer in the liquid phase. This paper is sized to Chinese National Standard (CNS) A4 (210 X 297 mm) ) 495546 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Invention Description (4) Low. 2. Liquid / steam phase fluids, which are characterized by a high vapor pressure when transferring heat in the liquid or vapor phase. Three different chemicals (all aromatics) are the most commonly used fluids in this temperature range. 1.7% diphenyl ether / 27% biphenyl mixture, which is a liquid / vapor phase fluid. 2. Hydrogenated terphenyl / bi-terphenyl mixture, which is a liquid phase fluid. 3. Dibenzyl toluene, which is a liquid phase fluid. The main factors that define the range of fluid use are: 1. Thermal stability. 2 · Pour / crystallization temperature. The main factors that define the effectiveness within its operating range are: 1 • Heat transfer coefficient-the ability to load, transfer and output heat per unit time area at a selected temperature. The main factor in fluid use is its environmental impact-whether it is classified as a hazardous compound or not. Because these fluids sometimes leak from the system or leak out during transport, these fluids are classified by EPA as `` harmful ''. This incurs extra protection during use and is therefore expensive. Disadvantages of various fluid types: Biphenyl: 1 · Because of low thermal stability, it can only be used at 650 ° F. This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) ----------- installation -------- i. Order-I ------ -(Please read the notes on the back before filling this page) 495546 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (5) 2 · The heat transfer coefficient is quite low. '3. Use only in liquid phase. Dibenzyl toluene:. 1 · Due to low thermal stability, it can only be used at 660 ° F. 2 · The heat transfer coefficient is quite low. 3. Use only in liquid phase. D P 〇 / B I P: 1 · High pouring / crystallization temperature-leading to system shutdown problems, especially in colder weather. 2 • Contains biphenyls-Leaks in excess of 100 pounds can cause damage to the environment. The purpose is to propose a single fluid that can operate in the liquid / steam phase and has acceptable stability at 700 ° F, provides a sufficiently low pour / crystallization temperature, has a high heat transfer coefficient, and is exposed to ambient conditions. The amount is very small. This heat transfer coefficient is the main indicator of the heat transfer capacity of the heat transfer medium. Therefore, fluids with higher heat transfer coefficients at selected temperatures are expected to transfer more heat per unit heat exchanger surface area than those with lower heat transfer coefficients at the same temperature. Therefore, using a fluid with a higher heat transfer coefficient can produce a higher yield. Or shorten the production time. Attached Table 1 compares the heat transfer coefficient of a general type of heat transfer fluid with the heat transfer coefficient of the heat transfer fluid of the present invention, in which the amount of 'D P0 is greater than or equal to D P E. The paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) -8------------ installation -------- ^ order ------- (Please read the precautions on the back before filling this page) 495546 A7B7 V. Description of the invention (6) Comparison of heat transfer coefficient Table 1 Heat transfer coefficient-program 40 2 "tube (inner diameter 2.066") @ 流 率 7 英Ft / s temperature (° F) biphenyl 1 DBT2 73/27 DPO / BIP 95/5 DPO / DPE 85/15 DPO / DPE 75/25 DPO / DPE 50/50 DPO / DPE 600 360.66 369.86 445.65 452.16 447.24 443.79 442.23 625 365.46 377.52 444.77 454.05 449.45 445.47 444.73 650 369.08 385.29 442.68 455.37 450.36 447.53 445.68 675 N / A1 N / A2 438.85 457.06 451.31 447.83 444.83 700 N2 A4 450 A16 N / A1 450 Yes 650 ° F 2-The fluid supplier's recommended maximum use temperature is 660 ° F. The heat transfer coefficient is the capacity for fluid input, transport, and output. The higher the heat transfer coefficient of a fluid, the more heat it transmits per unit of heat exchange surface area ----------- installation -------- S-order l · ----- -< ^ 1 ^ — (Please read the notes on the back before filling out this page) Printed in Appendix 2 by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. The heat transfer coefficient of the transfer fluid, where the amount of DPE is greater than .4 DP. -9-This paper size is in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm) 495546 A7 V. Description of the invention (7) Comparison of heat transfer coefficients Schedule 2 Heat transfer coefficient temperature triphenyl 1 DBT2 73 / 27 95/5 85/15 75/25 (° F) DPO / BIP DPE / DPO DPE / DPO DPE / DPO 600 360.66 369.86 445.65 415.17 419.11 423.08 625 365.46 377.52 444.77 416.55 420.55 424.59 650 369.05 385.29 442.14 44.68 44 (Read the notes on the back and fill out this page)

^ The maximum temperature recommended by the fluid supplier is 650 ° F 2-The maximum temperature recommended by the fluid supplier is 660 ° F The heat transfer coefficient is the capacity for fluid input, transport, and output. The higher the heat transfer coefficient of a fluid, the more heat it can transfer per unit heat exchange surface area. The following Schedules 1 A-1 E and 2 A-2 C are derived from the heat transfer coefficients of Schedules 1 and 2. (+)% Is the percentage increase of the heat transfer coefficient of D PO, printed by DPO / DPE-DPE / Intellectual Property Bureau Employees Cooperatives of the Ministry of Economy, relative to the specified product. (1) Percent reduction of the heat transfer coefficient of 0% P0 / DPE-DPE / DP0 relative to the specified product. · ’This paper size is in accordance with China National Standard (CNS) A4 (210 X 297 mm) 495546 A7B7 V. Description of the invention (8

Attached Table 1 A Comparison of heat transfer coefficients printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs (%) 600T products 95/5 85/15 75/25 50/50 DPO / DPE DPO / DPE DPO / DPE DPO / DPE biphenyl +25.37 +24.01 +23.05 +22.62 Dibenzyltoluene + 25.25 + 20.92 +19.99 + 19.57 73/27 DPO / BIP + 1.46 + 0.36 -0.42 -0.77 Schedule 1 B Comparison of heat transfer coefficient (%) 625 T Product 95 / 5 85/15 75/25 50/50 DPO / DPE DPO / DPE DPO / DPE DPO / DPE bitriphenyl + 24.24 +22.98 +21.98 +21.69 dibenzyltoluene + 20.27 +19.05 +18.00 +17.80 73/27 DPO / BIP + 2.09 + 1.05 + 0.16 -0.01 ----------- · install --------- order · 1 -------- ^ 9— (Please read the back first Note: Please fill in this page again.) This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 495546 A7B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (9) Comparison of thermal coefficient (%) 650T. Product 95/5 85/15 75/25 50/50 DPO / DPE DPO / DPE DPO / DPE DPO / DPE bitriphenyl + 23.39 +22.03 +21.27 + 20.76 dibenzyltoluene + 18.19 +16.89 +16.15 +15.67 73/27 DPO / BIP + 2.87 + 1.73 + 1.11 + 0.68

Attached Table 1 D Heat transfer coefficient comparison (%) 675 T Product 95/5 85/15 75/25 50/50 DPO / DPE DPO / DPE DPO / DPE DPO / DPE Bistriphenyl N / A1 N / A 'N / AN / A Dibenzyltoluene N / A2 N / AN / AN / A 73/27 DP0 / BIP + 4.15 + 2.84 + 2.05 + 3.36 L The maximum temperature recommended by the fluid supplier is 650 ° F 2- Fluid supplier's recommendation The maximum operating temperature is 660 ° F (please read the precautions on the back before filling this page)-· Binding-L --- Φ. This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) -12- 495546 A7B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economy V. Invention Description (10)

Table 1E Comparison of heat transfer coefficients (%) 700T-products 95/5 85/15 75/25 50/50 DPO / DPE DPO / DPE DPO / DPE DPO / DPE biphenyl N / A1 N / AN / AN / A Dibenzyltoluene N / A2 N / AN / AN / A 73/27 DPO / BIP + 5.23 + 3.88 卞 3.35 + 1.79 ^ The maximum temperature recommended by the fluid supplier is 650 ° F 2-The maximum recommended by the fluid supplier The temperature is 660 ° F

Table 2A Comparison of heat transfer coefficients (%) 600T products 95/15 85/15 75/25 DPE / DPO DPE / DPO DPE / DPO bitriphenyl 1 +15.11 + 16.20 +17.31 dibenzyltoluene 2 +12.25 +13.32 + 14.39 7 3/27 DP0 / BIP -7.34 -6.33 -5.06 L The maximum temperature recommended by the fluid supplier is 650 ° F '2- The maximum temperature recommended by the fluid supplier is 660 ° F (Please read the precautions on the back first (Fill in this page again) The wood paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) -13- 495546 A7B7 V. Description of the invention (11) Schedule 2B Comparison of heat transfer coefficient (%) 625 T Product 95 / 15 85/15 7-5 / 25 DPE / DPO DPE / DPO DPE / DPO bitriphenyl 1 +13.98 + 1 5,0 7 +16.18 dibenzyltoluene 2 + 10.34 + 11.40 +12.47 73/27 DPO / BIP -6.77 -5.76, +4.75 ^ The maximum temperature recommended by the fluid supplier is 650 ° F 2-The maximum temperature recommended by the fluid supplier is 660 ° F ---

Schedule 2C

Comparison of heat transfer coefficients (%) 650T products 95/15 85/15 75/25 DPE / DPO DPE / DPO DPE / DPO bitriphenyl 1 + 19.55 +21.97 +21.30 dibenzyltoluene 2 + 14.51 +16.83 + 1 6 1 Q 7 3/27 DP0 / BIP -0.33 + 1 · 6 8 ____ Ding 丄 U · 丄 7, +1.12

\ The maximum temperature recommended by the fluid supplier is 650 ° F 丨 2-The maximum temperature recommended by the fluid supplier is 660 ° F Use ASTM D97 to determine the pouring temperature and crystallization temperature g of various fluids. Attached Table 3 lists the pouring temperature / crystallization temperature comparison of various fluids. The size of this paper applies to China National Standard (CNS) A4 (210 χ 297 mm) -14--------- installation -------- ί. Order ------- ( Please read the notes on the back before filling out this page) Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 Five B7 $ Description (12) • Comparison of pouring temperature / crystallization temperature of various fluids, Schedule 3 1 —_ / Crystallization temperature_ Product temperature ° F 'Triphenyl-15-15 Dicarbyl toluene-50 —73/27 DPO / BIP 54 95/5 DPO / DPE 54 —85/15 DPO / DPE 40 75/25 DPO / DPE 27 _ 50/50 DPO / DPE 10 95/5 DPE / DPO -30 85/15 DPE / DPO -21 75/25 DPE / DPO -13 1 ASTM D97 test method (Please read the precautions on the back before filling this page ) The thermal stability printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs can be defined as the property of thermal cracking of chemical bonds. Fluids with better thermal stability at selected temperatures than other fluids have a longer fluid life and will reduce system contamination due to thermal decomposition of the product. The thermal stability test was performed using an Ampule test procedure. The ampoule test is generally accepted industrially as a standard ' which is used to test the relative thermal stability of a heat transfer fluid. Although there is no standard A S T M ampoule test definition, the data served by this test have been proven to be reliable for many years. Change the method depending on the composition and diameter of the ampoule. In this method, the size of the paper is adapted to the Chinese National Standard (CNS) A4 (210 X 297 public love) 15 495546 A7 B7 V. Description of the invention (13) Except for the ampoule Of oxygen, determine the sample volume and temperature. However, some of these methods cannot remove oxygen. As long as the temperature in the furnace is maintained uniformly, the relative results obtained are still too low. This data is used to define the difference in thermal stability performance of the fluid in any selected system. The ampoule test procedure is as follows: Purpose: To determine the thermal decomposition of a heat transfer fluid under the same conditions in the absence of oxygen to determine relative thermal stability. A · Sample preparation 1 · Cut a 6 inch long, clean, dry 3 1 6 s s tube (inner diameter 1/2, outer diameter 5/6) sufficient for two test samples of each fluid. 2 · Rinse the inside of the tube with xylene and acetone successively, and let it dry with air. 3 • Plug each end of the tube with a stainless steel forging die. 4 · Mark the upper tubes 1 A, 1 B · • with metal etching tools. B · Sample preparation 1 · Place 5 ml samples in each ampoules (Sample # 1-5 ml. Place in an ampule labeled 1 A, 5 ml in an ampule labeled 1 B ... etc. ), And label the sample name and its ampoule. 2 · Leave 5 ml of each sample in a glass bottle and set aside as a reference group. 3 · Place the filled ampoule upright on a metal tube rack with the samples on both sides of the rack. This paper size applies to China National Standard (CNS) A4 specification (210 X 297 mm) ------------ install --- (Please read the precautions on the back before filling this page). Economy Printed by the Ministry of Intellectual Property Bureau's Consumer Cooperative 495546 A7 __ B7 V. Description of the invention (14) C · Oxygen removal, 1 · Place the filled, uncovered tube (in the rack) in the box. (Please read the precautions on the back before filling this page) 2 · Place the cover and required tools in the case Φ. 3 · Connect the nitrogen tube to take out the air in the bag with a 1/8 "tube. 4 · Load the plate as a working surface. 5 · Use the regulator to pass in nitrogen at 60 P si. 6 · After the bag begins to expand, use a tape Seal the open end. 7 • After the bag is fully inflated, open the suction valve. 8 • Reduce the pressure to 30 psi as indicated by the regulator. 9 • After the bag is inflated, insert the air jet (30 psi nitrogen) into each tube Up to 1 minute. 10. Seal the tube immediately after blowing nitrogen. D. Thermal stress 1. Place the prepared ampoule tube holder so that the selected temperature can be maintained at ± 1 ° F and the temperature gradient in the furnace should not exceed ±. · In a furnace at 5 ° F. 2 · Allow the furnace to reach the desired temperature and maintain the temperature for at least 3 3 6 hours (2 weeks) under the defined parameters. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 3 · End of period At that time, turn off the oven and allow the ampoules to cool undisturbed for 24 hours. E · Analysis 1 · Remove the caps from each ampule and pour into a 15 ml glass ampule with appropriate markings 17- This paper size is in accordance with China National Standard (CNS) A4 (210 X 297 mm) 495546 A7 B 7 V. Description of the invention (15) 2 · Analyze the retained reference sample and its appropriately processed sample by ASTM D 2997 Simdis gas chromatography. 3 · Calculate the high / low boiling point% of each sample relative to the reference sample 〇 The thermal stability test results are as follows: The comparison of the thermal stability (heat-resistant cracking resistance of the chemical bond at a selected temperature) of a general type of heat transfer fluid when DP 0 is greater than or equal to DPE is shown in Appendix 4. -------- ---- Install— (Please read the notes on the back before filling this page) Order: Printed by the Intellectual Property Bureau Staff Consumer Cooperative of the Ministry of Economic Affairs This paper applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) ) 495546 A7 B7 V. Description of the invention (16) Comparison of thermal stability Schedule 44 336 hours ampoule test. Thermal decomposition% temperature triphenyl 1 DBT2 73/27 95/5 85/15 80/20 75/25 50 / 50 (° F) DPO / BIP DPO / DPE DPO / DPE DPO / DPE DPO / DPE DPO / DPE 600 0.87 0.59 0.004 0.002 0.002 0.01 0.01 0.004 625 1.36 0.99 0.01 0.01 0.01 0.02 0.03 0.03 650 3.50 2.29 0.04 0.03 0.06 0.12 0.15 0.22 675 N / A1 N / A2 0.11 0.13 0.37. 0.60 0.88 1.60 700 N / A1 N / A2 0.49 0.48 1.67 2.89 4.50 7.42 ^ The maximum temperature recommended by the fluid supplier is 650 ° F The maximum temperature recommended by the fluid supplier is 660 ° F 3-The maximum temperature recommended by the fluid supplier is 750 ° F 4-Sample is analyzed by ASTM D2997 ------------ Install— (Please read the notes on the back before filling this page) ί Order. The amount of DPE printed by the Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs A comparison of the thermal stability (heat-resistant cracking resistance of chemical bonds at a selected temperature) of a general type of heat transfer fluid when it is greater than DP0 is shown in the attached table 19- This paper size is applicable to the Chinese National Standard (CNS) A4 specification (21 (^ 297) %) 495546 V. Description of the invention (17) Comparison of thermal stability of A7 B7 Schedule 54 Thermal decomposition of 336-hour ampoule test% Temperature triphenyl 1 DBT2 73/27 95/5 85/15 75/25 (° F) DPO / BIP DPE / DPO DPE / DPO DPE / DPO 600 0.87 0.59 0.004 0.09 0.01 0.01 625 1.36 0.99 0.01 0.27 0.15 0.09 650 3.50 2.29 0.04 1.40 1.02 0.85 ^ The maximum temperature recommended by the fluid supplier is 650 ° F 2-fluid supply The maximum recommended temperature is 660 ° F 3_The maximum temperature recommended by the fluid supplier is 750 ° F 4- Samples are analyzed by ASTM: D2997 ·· ------------------------ Please read the precautions on the back first (Fill in this page) Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. Therefore, these various compositions confirm that the heat transfer coefficient and thermal stability of the diphenyl ether / 1 · 1-diphenylethane mixture are superior to those of biphenyl and diphenyl. Benzyl toluene, with a heat transfer coefficient equal to or better than the eutectic mixture of diphenyl ether and biphenyl, and can provide a lower pouring temperature, and finally can avoid the use of biphenyl which is currently quite industrially important. Various features of the present invention have been shown and described with the embodiments of the present invention, but it should be understood that these specific examples are for illustrative purposes only, and the most complete description of the present invention can be found in the scope of the appended patent applications. This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) -20-

Claims (1)

495546 Male I A8 B8 C8 D8 Xiao 21 6. Applying for the scope of rhinitis · Attachment I (A) No. 8 8 1 1 5 9 3 No. 8 Patent Application in Chinese Amendment of Patent Range in the Republic of China September 1990 Revision 1 · A heat transfer fluid, which is characterized by its inclusion A mixture of dibenzoic acid and amidine, 1-diphenylethane. 2. The heat transfer fluid according to item 1 of the application, wherein the 1,1-diphenylethane is composed of a mixture of 1,1-diphenylethane and one or more impurities. 3. The heat transfer fluid according to item 2 of the patent application, wherein one or more impurities are selected from the group consisting of diphenylmethane and 1,2-diphenylethane. 4. The heat transfer fluid according to item 1 of the patent application scope, wherein the 1,1-diphenylethane basically comprises 1,1-diphenylethane, 1,2-diphenylethane and di Mixture of phenylmethane. 5. The heat transfer fluid according to item 4 of the patent application, wherein the i, 1-diphenylethane is 92 to 95% by weight of the mixture, and the 1, 2-diphenylethane is the mixture From 7 to 4% by weight, the diphenylformamone is 1% by weight of the mixture. 6. The heat transfer fluid according to item 1 of the patent application range, wherein the amount of 1,1-diphenylethane exceeds or equals the amount of diphenyl ether. 7. The heat transfer fluid according to item 1 of the scope of patent application, wherein the amount of the diphenyl ether exceeds or equals the amount of the 1,1-monophenyl ethyl compound. 8. The heat transfer fluid according to item 7 in the scope of the patent application, wherein the diphenyl ether is present in an amount of 95 to 5% by weight based on the mixture, and the Chinese paper standard (CNS) is used for the paper size A4 specifications (210x297) ^ ~ '~ " ~ " (Please read the precautions on the back—installation—and then fill out this page) Order! Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs and Consumer Cooperatives 495546 A8 B8 C8 D8 々 2. The scope of patent application · 1, 1-diphenylethane is present in an amount of 5 to 50% by weight of the mixture ° 9. For example, the heat transfer fluid of item 8 of the scope of patent application, wherein the diphenyl ether Is present in an amount of 90 to 95% by weight based on the mixture, and 1,1-diphenylethane is present in an amount of 5 to 10% by weight based on the mixture. The heat transfer fluid of item 8 in which the diphenyl ether is present in an amount of 80 to 90% by weight based on the mixture, and the 1,1-diphenylethane is present in the mixture 10 to 20% by weight of J. 1 1. The heat transfer fluid according to item 8 of the scope of patent application, wherein: The phenyl ether is present in an amount of 70 to 80% by weight based on the mixture, and the 1,1-diphenylethane is present in an amount of 2 to 30% by weight based on the mixture. 1 2 The heat transfer fluid according to item 8 of the application, wherein the diphenyl ether is present in an amount of 45 to 55 wt% based on the mixture, and the 1,1-diphenylethane is present in an amount 4 5 f based on this mixture -------- install-(Please read the precautions on the back before filling out this page) Order 丨 .. will be printed at the Intellectual Property Bureau Employee Consumer Cooperatives of the Ministry of Economic Affairs to print% The weight of this paper is in accordance with China National Standard (CNS) A4 (210X297 mm) -2-