▎ 摘　　要

NOVELTY - Composition comprises a starch-based surfactant including carboxymethyl starch salt and alkyl glycoside surfactants. USE - The composition is useful for inhibiting hydrate decomposition, and coupling-enhanced solid hydrate and improving storage and transportation stability of solid hydrates (all claimed). ADVANTAGE - The composition not only improves the interface stability of the hydrate phase boundary, but can also improves the mechanical stability of the hydrate and enhances the strength of the hydrate crystal interface since the colloidal solution formed by dispersing the sodium carboxymethyl starch and the alkyl glycoside surfactant in water can coat the surface of the hydrate to form a protective layer, thus improving the structural stability of the hydrate; reduces the decomposition rate of the hydrate, and can further reduce the decomposition amount of the hydrate, enhanced the storage and transportation stability of the solid hydrate. The solid hydrate storage and transportation technology of natural gas has relatively high gas storage capacity, relatively safe and reliable non-explosive storage process, and has been widely researched and applied in this industry as an emerging alternative gas storage technology. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) coupling-enhanced solid hydrate comprising composition, where the coupling-enhanced solid hydrate is stored at 268.15 K and 0-0.5 MPa for 18 hours before decomposing and recovering the decomposed gas, and the gas recovery rate is not less than 82%, the hydrate is stored for 18 hours under the conditions of 268.15 K and 0-0.5 MPa, and the decomposition rate is less than 15%; and (2) method for improving storage and transportation stability of solid hydrates, comprising performing hydrate production process by dispersing hydrate forming agent in the aqueous phase, and contacting gas with the aqueous system in which the hydrate forming agent is dispersed under the hydrate formation conditions to obtain a solid hydrate core, then adding the dispersion containing starch-based surfactant under the condition of hydrate formation, forming a hydrate protective layer covering the solid hydrate core body outside the solid hydrate core body to obtain a coupling enhanced solid hydrate, where starch-based surfactants include carboxymethyl starch salt and alkyl glycoside surfactants, and performing hydrate storage and transportation process by storing the coupled-enhanced solid hydrate generated in the hydrate production process and transporting under the self-protection conditions of the hydrate, and decomposing the coupled-enhanced solid hydrate through the hydrate storage and transportation step under the conditions of hydrate decomposition to release the gas