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1- MCP/modified stabilizer coating material, production method and use thereof

A technology of methylcyclopropene and stabilizer, which is applied in hydrocarbons, chemical instruments and methods, purification/separation of hydrocarbons, etc., can solve the problem of shortening the storage and transportation validity period of preservatives, the influence of external temperature and humidity, and the separation Reduce pressure concentration and other problems, achieve the effect of improving gas stability, low cost, and reducing decomposition

Inactive Publication Date: 2013-08-14
冯建国
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the past ten years, although many scientific experiments have made a series of breakthroughs in the loading and release of 1-methylcyclopropene, some gas, liquid and solid 1-methylcyclopropene preservatives have come out one after another, but some important technology is yet to be perfected
For example, the purification and stabilization of synthetic gas, and the reduction of the partial pressure concentration of gas 1-methylcyclopropene during loading, which leads to the reduction of loading rate
The combination of 1-methylcyclopropene and the carrier is too weak, and it is easily affected by external temperature and humidity, which shortens the shelf life of the preservative for storage and transportation, and the cost of stabilizers such as a-cyclodextrin is high.

Method used

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  • 1- MCP/modified stabilizer coating material, production method and use thereof
  • 1- MCP/modified stabilizer coating material, production method and use thereof
  • 1- MCP/modified stabilizer coating material, production method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 500ml of loading solution (pH value 3) of acetic acid and sodium acetate mixed solution in the loader, play molecular lock effect soluble salt mixture (calcium sulfate and sodium carbonate each 10g), then add 100g modified stabilizer modified starch ( YD starch), seal the loader, vacuumize, blow N2 gas to drive out the air, put the loader into an ice-water bath, control the temperature at 4°C-8°C, start stirring, the loader pressure is about 0.03Mpa, put 1-formazol The methylcyclopropene gas is passed into the loader, and the 1-methylcyclopropene in the tail gas of the loader is sent to the nitrogen-enriched membrane treatment device for enrichment treatment, and then recycled to ensure that the 1-methylcyclopropene in the raw material gas is absorbed and reacted for 10 hours. The concentration of methylcyclopropene is relatively stable, and a mixture of 1-methylcyclopropene / modified stabilizer is formed, and the material loading liquid is released, centrifuged and d...

Embodiment 2

[0035] Synthesis of 1-methylcyclopropene: In a 1000ml reaction vessel, vacuumize, fill nitrogen with slight positive pressure, add 400ml of dry tetrahydrofuran, 160g of sodium amide, start stirring, start condensing and reflux, slowly raise the temperature to 62°C, and start slowly dripping Add 100 g of 3-chlorodimethylpropene. After the dropwise addition, continue to stir for 80min;

[0036] N through bubbler 2(The bubbler is inserted into the reaction solution), carry out the gas stripping operation, and put forward the product gas 1-methylcyclopropene stably, and after the by-products such as ammonia gas and impurities are gas-washed by three gas scrubbers, they are sent to the nitrogen-enriched Membrane treatment device;

[0037] The process flow of nitrogen-enriched membrane treatment device is as follows: figure 1 , the product gas enters the membrane separation device after the cleaner 1, and the operating pressure difference is 800KPa. The nano-membrane separation m...

Embodiment 3

[0042] According to the preparation method of Example 2, 1-methylcyclopropene / modified stabilizer inclusions were prepared:

[0043] Synthesis of 1-methylcyclopropene: 300g of lithium diisopropylamide as raw material, slowly raise the temperature to 35°C, start to slowly add 300g of 3-chlorodimethylpropene dropwise, after the dropwise addition, continue to stir for 100min, and process with nitrogen-enriched membrane The operating pressure difference is 600KPa, and the product gas concentration is increased by 28%.

[0044] The load of 1-methylcyclopropene: the load liquid 500ml (pH value 6) of acetic acid and sodium acetate mixed solution, each 8g of soluble salt ammonium carbonate, sodium carbonate, the syngas concentration before entering loader is 38% (volume), The modified stabilizer is 50 g of modified starch, 20 g of methyl β-cyclodextrin, and 10 g of α-cyclodextrin. After circulating and absorbing for 3 hours, the concentration drops to 23%. After being sent to the nit...

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Abstract

The invention relates to 1-methyl cyclopropene, namely inclusion complex of 1-methyl cyclopropene / modified stabilizer, characterized in that the weight percentage of effective 1-methyl cyclopropene in inclusion complex is 0.15-4.8%; the modified stabilizer is prepared by the raw materials as follows in terms of parts by weight: 20-100 parts of modified starch, 0-80 parts of beta-cyclodextrin or derivatives thereof, 0-40 parts of alpha-cyclodextrin, or one or more derivatives thereof. The inclusion complex of 1-methyl cyclopropene / modified stabilizer prepared by the special inclusion of the invention has stable characteristic without the influence from temperature and humidity of environment and releases quantitatively when used. The invention is characteristic in easy implementation, safe, and reliable. The preparation method has simple process with low cost. The invention is suitable for persevering flowers, vegetables, and fruits having respiratory activity.

Description

1. Technical field [0001] The present invention relates to 1-methylcyclopropene, especially its modified stabilizer insert, and also relates to its preparation method and application. 2. Background technology [0002] my country is one of the largest consumption countries of flowers, vegetables and fruits in the world. Because fresh-keeping technology is relatively backward compared with developed countries such as Europe, America and Japan, the annual loss of vegetables and fruits reaches hundreds of millions of tons, accounting for 20-30% of the total output. Humans have discovered from long-term practice that ethylene is a phytohormone that accelerates the premature maturity of plants and the senescence of climacteric fruits. Ethylene is absorbed by receptors in plants, causing yellowing of leaves, stagnation of growth, premature fruit ripening, and detachment of flowers and leaves. [0003] Years of scientific experiments have shown that blocking the ethylene receptors ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/20
Inventor 冯建国
Owner 冯建国
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