Objective　With　the　rapid　growth　of　textile　consumption,　its　effeetive　recycling　has　become　an　urgent　ohallenge.　Polyethylene　terephthalate　(PET)　is　a　major　commercial　fabric　material,　with　significant　annual　production　and　eonsumption.　Due　to　production　requirements,　a　variety　of　dyes　and　auxiliaries　are　usually　added　to　PET　fabrics,　and　these　additives　eause　degradation　of　product　quality　in　the　chemical　recycling　process,　which　is　not　conducive　to　aehieving　high-value　recycling　and　closed-loop　recycling.　Therefore,　it　is　necessary　to　pre-decolorize　the　fabrics　so　as　to　reduce　the　bürden　for　the　subsequent　purification　of　bis　(hydroxyethyl　terephthalate)　(BHET).　In　this　study,　it　was　proposed　to　decolorize　PET　fabrics　using　solvent　extraction　method,　and　the　influence　of　decolorization　on　PET　glycolysis　Performance　were　further　examined.Method　The　PET　fabrics　samples　were　cut　into　small　pieces　of　approximately　2　cmx2　cm　beforehand,　and　the　PET　pieces　were　washed　and　dried.　Then,　a　certain　amount　of　PET　samples　was　added　into　solvent　in　a　three-neck　flask,　which　was　connected　with　a　condenser.　The　flask　was　placed　in　an　oil　bath　to　maintain　the　required　temperature.　After　decolorization,　the　fabrics　pieces　were　taken　out　and　washed,　dried　in　an　oven　at　60　°C.　The　L＂,a*,b＂　values　before　and　after　decolorization　were　determined　by　chromameter,　and　then　the　decolorization　ratio　was　calculated.　The　gravimetric　method　was　adopted　to　calculate　the　BHET　recovery　rate　of　PET　glycolysis.　The　purity　of　the　recovered　BHET　was　determined　by　high-performance　liquid　chromatography.Results　Solvent　Screening　experiments　among　different　types　of　solvents　(i.　e,　single　organic　solvent,　mixed　solvent,　and　deep　eutectic　solvent　(DES))　were　conducted　based　on　the　decolorization　ratio　and　PET　textile　mass　loss　for　two　single-color　PET　fabrics.　Among　them,　DES　was　found　not　suitable　for　use　as　a　decolonization　solvent　because　of　its　high　viscosity.　Considering　the　general　decolorization　effect　of　solvents　on　PET　fabrics,　acetic　acid　and　chlorobenzene,　which　are　more　effective　in　decolorization　and　easy　to　recycle　and　use,　were　finally　selected　as　the　optimal　solvents.　Then,　the　operating　parameters　(i.　e.,　operating　temperature,　solid-liquid　mass　ratio　and　decolorization　time)　optimization　were　carried　out　through　single-factor　experiments　for　acetic　acid　and　chlorobenzene　decolorization,　and　the　optimal　operating　condition　for　acetic　acid　was　identified　to　be　temperature　130　°C,　solid-liquid　ratio　1:30,　and　treatment　time　20　min　for　acetic　acid.　For　chlorobenzene　decolorization,　it　was　evident　that　the　concerned　parameters　had　little　effect　on　the　decolorization　Performance.　In　order　to　test　the　universality　and　suitability　of　the　two　types　of　solvents,　nine　PET　fabrics　with　different　colors　were　decolorized　using　acetic　acid　and　chlorobenzene　under　the　optimal　conditions,　and　the　optimal　decolorization　ratios　were　all　higher　than　80%,　reaching　82.9%　and　88.4%,　respectively.　In　particular,　the　general　applicability　of　chlorobenzene　decolorization　was　better,　with　decolorization　ratios　higher　than　75%　for　most　samples.　Decolorization　with　acetic　acid　and　chlorobenzene　did　not　affect　glycolysis　and　even　contributed　to　the　increase　in　BHET　recovery　rate.　Especially,　after　decolorization　with　chlorobenzene,　a　general　increase　of　5%-12%　was　achieved　in　BHET　recovery　rate.　In　addition,　the　BHETs　recovered　through　the　decolorized　fabrics　were　still　of　high　quality,　with　purity　greater　than　90%　for　all.Conclusion　Different　types　of　solvents　(i.　e,　single　organic　solvent,　mixed　solvent,　and　deep　eutectic　solvent)　were　used　for　PET　fabrics　decolorization,　and　acetic　acid　and　chlorobenzene　were　chosen　as　the　optimal　solvents.　The　selected　solvents　can　be　used　for　PET　fabrics　with　other　colors,　and　the　optimal　decolorization　ratio　for　the　nine　fabrics　tested　was　more　than　80%.　Moreover,　decolorization　did　not　affect　the　glycolysis　reaction,　ensuring　high　recovery　and　purity　of　BHET.　Removal　part　of　the　dye　from　textiles　by　extraction　before　glycolysis　can　greatly　reduce　the　bürden　of　subsequent　purification　of　BHET,　which　is　more　economical　and　has　greater　potential　for　industrialization.　©　2025　China　Textile　Engineering　Society.　All　rights　reserved.