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The exothermic behaviors of butanol, butyraldehyde, butanone, and butyric acid with nitric acid were studied by adiabatic accelerating rate calorimeter(ARC), and the test results were compared and analyzed, and the system risk was evaluated by THI index method. The results show that under the condition of the zero oxygen balance, butyraldehyde-HNO3 system has the most obvious self-exothermic. When the butyraldehyde content is only 0.14 g, the adiabatic temperature of the system rises to 118.4 ℃ and the heat release amount is 776.6 J/g; butanol-HNO3 system begins to emit heat at about 40.2 ℃, and the highest temperature in the exothermic stage of self-reaction reaches 145.7 ℃ and the maximum pressure reaches about 34 bar(1 bar=105 Pa). Butanone-HNO3 system releases heat from 50 ℃ to 136 ℃, and the amount of heat released is 564.0 J/g. No exothermic point is observed in butyric acid-HNO3 system in the temperature range of less than 140.0 ℃. With the increase of nitric acid concentration(2.0→6.0 mol/L), the risk of butanol-HNO3 system increases from medium to high level. The risks of reaction systems of butanol, butyraldehyde, butanone and butyric acid with 4.0 mol/L HNO3 are at higher, higher, middle and middle levels.

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[Objectives] This article simulated different temperature fluctuation conditions[-1 ℃, (-1±3)℃, (-1±5)℃], and explored the effect of precise temperature control technology on the preservation of fresh pork during ice-temperature storage. [Methods] The longest pig dorsal muscle was selected as the study object. Total viable counts, volatile base nitrogen, sensory evaluation and volatile organic compounds were determined to study the changes in the quality of fresh pork stored at ice temperature under precise temperature control. [Results] The results indicated that the quality and shelf life of fresh pork during ice-temperature storage were significantly affected by temperature fluctuations. After storage for 12 days, total viable counts in two fluctuating groups increased significantly, TVB-N content were significantly higher than that of -1 ℃ group. The sensory scores of two fluctuation groups were significantly reduced, and the odour was significantly different compared with -1 ℃ group. GC-IMS results showed that the contents of butanal, 2-heptanone, 2-pentanone, ethyl acetate, isoamyl acetate, isopropyl acetate, alpha pinene, styrene and methylpyrazine significantly increased in two fluctuating groups. There was no significant difference of the total viable counts, TVB-N and sensory indicators between two fluctuating groups in the middle and late storage period. [Conclusions] The shelf life of fresh pork in two fluctuation groups [(-1±3)℃ and(-1±5)℃] were shorter than that of -1 ℃ group by 2-3 days, and the stable ice-temperature storage (-1 ℃) was more conducive to maintaining the quality of fresh pork. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Chinese Institute of Food Science & Technology / Zhongguo Shipin Xuebao is the property of Journal of Chinese Institute of Food Science & Technology Periodical Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A process technology is developed to recover the effective components in off-gas from the reactive system of hydroformylation of propylene. Methods This technology uses the process route of "dealdehyde-cryogenic separation-stabilization-distillation", i. e., firstly removing the heavy components such as butyraldehyde by distillation column and condensing the components above C3 into liquid by ammonia circulating cryogenic process, and then removing butyraldehyde, trace moisture and non-condensable gas by the stable system, and finally obtaining propylene and propane products by distillation process. Results After the commercial application of this technology, the design capacity of the off-gas effective components recovery unit is 17.72 X 10³ t/ a. The total recovery of propylene, propane and butyraldehyde is 14.28 X 10³ t/a on the basis of operation time of 8 400 hours per year, and their purities are all greater than or equal to 97.00wt%, their yields all exceed 95.0 % . Conclusions The actual values are better than the design ones after calibration. Compared with other units, this unit has the advantages of low energy consumption, no auxiliary material consumption, high yield and purity of products. [ABSTRACT FROM AUTHOR]

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Brewing is the property of China Brewing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)