558562 A7 ________B7 五、發明説明（1 ) ^ -- 發明背景 1.發明領域： 本發明有關二元酸之二烷酯（DBE)個別或混合地作為溶劑 .，以選擇性地自混合塑料流分離及回收聚苯乙婦及聚對苯 二甲酸乙二醇酯的用途。詳言之，但非限制地，本發明有 關己一酸一甲S曰、戊二酸二甲酯、丁二酸二甲酯及其混合 物在兩個不同的溫度範圍内，依序選擇性地溶解聚苯乙稀 及聚對苯二甲酸乙二醇酯PET的用途。 2.相關技藝描述： 因為環境議題/意識的逐漸增加，建立一種安全且具成本 效益之技術以回收聚笨乙烯及聚對苯二曱酸乙二醇醋pET的 需求曰益受到重視。聚苯乙烯發泡物之處置傳統上係藉由 焚化或熱處理來進行。焚化雖然為一種處置方法，但無法 再利用該聚苯乙烯材料。藉由熱處理縮減聚苯乙烯之體積 導致聚苯乙烯受損，而產生品質較差之再利用材料。 已知技藝界（參照例如美國專利第5,629,352號；第 4,031，039 號；第 5,223,543 號；第 5,891，403 號；及第 4,5 17,3 12號）所述之另一種回收聚笨乙烯之方法係將聚苯乙 烯溶解於一有機溶劑中。尤其是己二酸二甲酯、戊二酸二 甲自旨、丁二酸二甲S旨及此％•二酯之混合物已於日本之工業 界中用以溶解發泡之聚笨乙烯。該種技術需使用數種技術 中之一自該有機溶劑回收所溶解之聚苯乙烯。該種技術包 括但不限於沉澱、擠塑、及急驟蒸發。因為在低溫下將聚 笨乙烯溶解於有機溶劑中不使該聚笨乙烯降解，故是一種 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐) 558562 A7 B7 五、發明説明（2 ) 較佳方法。 •發明概述 本發明提出一種自塑料混合物回收聚苯乙烯及聚對笨二 甲酸乙二醇酯之方法，其中該塑料混合物係包括聚苯乙烯 及聚對苯二曱酸乙二醇酯，同時結合有至少一種其他塑料 ，包括以下步驟： (a) 含有聚苯乙烯及聚對苯二甲酸乙二醇酯之塑料混合物 於由〇°C至低於160°C之溫度下與包含二元有機酸酯之 溶劑接觸，以自該塑料混合物溶解聚苯乙烯，而不溶 解聚對苯二甲酸乙二醇酯及其他塑料，因而產生兩個 別不相溶混之相，該二元有機酸酯係選自包括己二酸 二烷酯、戊二酸二烷酯、丁二酸二烷酯及其混合物之 群’其中該烷基或相同或相異，且具有由1至12個碳 原子； (b) 分離步驟（a)所產製之含有溶解聚苯乙烯相的溶劑與未 >谷解之聚對苯二甲酸乙二醇g旨及其他塑料，以回收聚 苯乙烯； (c) 步驟（b)所製之未溶解聚對苯二甲酸乙二醇酯及其他塑 料於由160。(：至225 °C之溫度下與包含二元有機酸酯之 溶劑接觸’以自該未溶解聚對笨二甲酸乙二醇酯及其 他塑料溶解聚對笨二甲酸乙二醇酯，而不溶解其他塑 料’因而產生兩個別不相溶混之相，該二元有機酸酯 係遠自包括己一酸二院S旨、戊二酸二烧醋、丁二酸二 烧S旨及其混合物之群，其中該烷基或相同或相異，且558562 A7 ________B7 V. Description of the invention (1) ^-Background of the invention 1. Field of the invention: The present invention relates to diacids of dibasic acids (DBE) individually or in combination as a solvent. To selectively separate from mixed plastic streams And the use of recycling polystyrene and polyethylene terephthalate. In detail, but not by way of limitation, the present invention pertains to monomethyl adipate, dimethyl glutarate, dimethyl succinate and mixtures thereof in a selective manner in two different temperature ranges in order. Use for dissolving polystyrene and polyethylene terephthalate PET. 2. Description of related skills: As environmental issues / consciousness are gradually increasing, the need to establish a safe and cost-effective technology to recover polystyrene and polyethylene terephthalate pET has been valued. Disposal of polystyrene foam has traditionally been performed by incineration or heat treatment. Although incineration is a disposal method, the polystyrene material can no longer be used. Reducing the volume of polystyrene by heat treatment causes damage to the polystyrene, resulting in poor quality recycled materials. Known in the art world (refer to, for example, US Patent No. 5,629,352; No. 4,031,039; No. 5,223,543; No. 5,891,403; and No. 4,5 17,3 12,) The method is to dissolve polystyrene in an organic solvent. In particular, dimethyl adipate, dimethyl glutarate, dimethyl succinate, and mixtures of these% diesters have been used in the industrial world in Japan to dissolve foamed polyethylene. This technique requires one of several techniques to recover the dissolved polystyrene from the organic solvent. Such techniques include, but are not limited to, precipitation, extrusion, and flash evaporation. Because polystyrene is dissolved in organic solvents at a low temperature without degrading the polystyrene, it is a paper standard that is applicable to Chinese National Standard (CNS) A4 specifications (210 X 297 mm) 558562 A7 B7 V. Description of the invention (2) The preferred method. • Summary of the invention The present invention proposes a method for recovering polystyrene and polyethylene terephthalate from a plastic mixture, wherein the plastic mixture comprises polystyrene and polyethylene terephthalate, and simultaneously combines There are at least one other plastic including the following steps: (a) Plastic mixture containing polystyrene and polyethylene terephthalate at temperatures from 0 ° C to less than 160 ° C and containing a binary organic acid The solvent of the ester is contacted to dissolve polystyrene from the plastic mixture, but not to dissolve polyethylene terephthalate and other plastics, thereby generating two different immiscible phases. The binary organic acid ester system Selected from the group consisting of dialkyl adipate, dialkyl glutarate, dialkyl succinate, and mixtures thereof, wherein the alkyl group is either the same or different and has from 1 to 12 carbon atoms; ( b) separating the solvent containing the dissolved polystyrene phase produced from step (a) and non-granulated polyethylene terephthalate g and other plastics to recover polystyrene; (c) step (B) Undissolved polyethylene terephthalate and its preparation He is plastic at 160. (: Contact with a solvent containing a dibasic organic acid ester at a temperature of up to 225 ° C to dissolve the polyethylene terephthalate from the undissolved polyethylene terephthalate and other plastics without Dissolving other plastics' thus produces two immiscible phases. The binary organic acid esters are far away from adipic acid, glutaric acid, succinic acid, succinic acid, and succinic acid. A group of mixtures in which the alkyl group is either the same or different, and
具有由1至12個碳原子；及 (d) v驟（c)所製之含有溶解聚對笨二甲酸乙二醇酯相之溶 劑與未溶解之其他塑料分離，因而回收聚對苯二甲酸 乙一 _酉旨。 較佳係將含有溶解聚對苯二甲酸乙二醇酯之溶劑冷卻至 低於160 C之溫度，使聚對苯二τ酸乙二醇酯自溶液沉澱， 以單離並回收該聚對苯二甲酸乙二醇酯。相同地，聚苯乙 婦係藉著自含有溶解聚苯乙烯之溶液蒸發溶劑而單離並回 收。最終微量之DBE可在產物製造等過程中所使用之後續 熔體擠塑期間自所回收之塑料移除，而該DBE可再作為溶 劑。較佳溶劑係選自己二酸二甲酯、戊二酸二甲酯、丁二 酸二f酯及此等二酯之混合物。 本發明之目的係提出一種使用單一 DBE溶劑系統，在兩 個不同之溫度範圍下，自混合塑料廢流同時回收聚苯乙烯 及聚對笨二甲酸乙二醇酯之改良方法。本發明另一目的係 提出一種自亦含有聚烯烴諸如LDPE、HDPE、及pp之混合 塑料流回收聚苯乙烯及聚對笨二甲酸乙二醇酯ΡΕτ之經濟方 法。在針對附圖充分閱讀附帶之說明及申請專利範圍後， 可明瞭此寺目的及存在性的實現性及其他目的的實現性。 圖式簡單說明 圖1係為說明自藏合塑料廢流回收聚苯乙稀及聚對笨二甲 酸乙二醇酯PET之方-法的流程圖。 發明詳述 可使用於本發明之液相溶劑係包括—元有機酸之二烧g旨 -6- 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公爱) 558562 A7 B7 五、發明説明（4 ) (DBE)，或個別使用或混合使用。此等所謂之DBE顯然係為 聚苯乙烯之溶劑，因為DBE在寬幅條件及濃度範圍内溶解 聚笨乙烤。可使用於本發明之有機醋較佳係藉著二元有機 酉文诸如己一酸、戍一 3文、丁 一酸、此等二元酸之經c 1至C 4 烧基取代之衍生物、及混合物等與具有1至12個碳原子之醇 類或醇類混合物進行反應而形成或製得。特別令人感興趣 的疋己—酸、戍一酸、及丁 —酸之二f ®旨、此等二甲醋之 合物及丁 一酸2 -乙i曰及戍一酸2 -甲S旨及己二酸、戊二酸及 丁二酸之二異丁醋的混合物。該溶劑係位於Delaware之It has 1 to 12 carbon atoms; and (d) v step (c) The solvent containing the dissolved polyethylene terephthalate phase is separated from other undissolved plastics, so that the polyterephthalic acid is recovered乙 一 _ 酉 Purpose. Preferably, the solvent containing the dissolved polyethylene terephthalate is cooled to a temperature lower than 160 C, and the polyethylene terephthalate is precipitated from the solution to separate and recover the polyethylene terephthalate. Diethylene glycol dicarboxylate. Similarly, polystyrene women are isolated and recovered by evaporating the solvent from a solution containing dissolved polystyrene. The final trace amount of DBE can be removed from the recovered plastic during subsequent melt extrusion used in the product manufacturing process and the DBE can be used as a solvent. The preferred solvent is selected from the group consisting of dimethyl adipate, dimethyl glutarate, dimethyl succinate, and a mixture of these diesters. An object of the present invention is to propose an improved method for simultaneously recovering polystyrene and polyethylene terephthalate from a mixed plastic waste stream at two different temperature ranges using a single DBE solvent system. Another object of the present invention is to provide an economical method for recovering polystyrene and polyethylene terephthalate PETE from a mixed plastic stream that also contains polyolefins such as LDPE, HDPE, and pp. After fully reading the attached description and the scope of patent application for the attached drawings, the realization of the purpose of the temple and its existence and the realization of other purposes can be understood. Brief Description of the Drawings Figure 1 is a flow chart illustrating a method for recovering polystyrene and polyethylene terephthalate PET from a plastic waste stream from Tibet. Detailed description of the invention The liquid-phase solvent systems that can be used in the present invention include-two organic acids of organic acids g-6-This paper size applies Chinese National Standard (CNS) A4 specifications (210 X 297 public love) 558562 A7 B7 V. Invention Description (4) (DBE), or used individually or in combination. These so-called DBEs are obviously solvents for polystyrene because DBE dissolves polystyrene in a wide range of conditions and concentrations. The organic vinegar that can be used in the present invention is preferably a derivative substituted by a C 1 to C 4 alkyl group through a dibasic organic script such as adipic acid, hydrazine, succinic acid, and the like. , And mixtures are formed or prepared by reacting with alcohols or alcohol mixtures having 1 to 12 carbon atoms. Of particular interest are hexanoic acid, osmic monoacid, and butyl-acid bis, f ®, these dimethyl vinegar compounds, and succinic acid 2-acetyl, and osmic monocarboxylic acid 2-formaldehyde. Purpose and mixture of adipic acid, glutaric acid and succinic acid. This solvent is located in Delaware
Wilmington之杜邦公司（Ε·Ι· Du Pont de Nemours and Company, Inc.)的產物，名稱DBE。 本發明溶劑系統被認為特別可用於在聚烯烴存在下，自 聚對苯二甲酸乙二醇酯PET分離、回收及再利用聚苯乙烯。 此種聚苯乙烯之溶解一般係於由〇。〇至低於16〇。〇之溫度範 圍下’於基本上大氣壓下（唯可使用較高壓力，但非必要）達 成。5玄 >谷劑糸統亦視為可塌疼且後續地溶解一般任何低密 度聚笨乙烯發泡物，尤其是包括開口及密閉蜂窩型發泡物 及所謂珠粒型聚苯乙烯發泡物。選擇性地溶解聚笨乙烤之 方法通常係於低至由1重量百分比聚苯乙烯及99重量百分比 溶劑系統至40重量百分比聚苯乙烯及6〇重量百分比溶劑的 組成範圍内進行。含有溶解聚苯乙烯之溶液相可藉著技藝 界一般已知之方法而簡便地與未溶解之塑料分離，包括例 如但不限於過濾、傾析、蒸發及其類者。所回收之軟化聚 苯乙稀亦可進行再處理，藉著該種後續方法諸如於注射及/ 本紙張尺度適用f國國家標準(CNS) A4規格(21〇Χ297公董)------- B7 五、發明説明（5 ) 或擠塑模製期間回收殘留之溶劑。自該後續處理取出之揮 發溶劑可較佳係循環至該溶劑/聚苯乙烯接觸步驟（即溶解聚 笨乙烯）或其類者。 本發明溶劑系統亦視為特別可用於自該聚烯烴分離、回 收及再彳盾環聚對苯二甲酸乙二醇酯ΡΕτ。然而，此種聚對笨 二甲酸乙二醇酯PET之溶解一般係於由16〇至225它之高溫範 圍下達成，基本上仍使用大氣壓（唯仍可使用較高壓力，但 非必要）。在高溫下選擇性地溶解聚對苯二甲酸乙二醇酯 PET之方法通常係於低達由1重量百分比聚對苯二甲酸乙二 醇酯PET及99重量百分比溶劑系統至4〇重量百分比聚對笨二 甲酸乙二醇酯PET及60重量百分比溶劑之組成範圍下進行。 含有溶解聚對苯二甲酸乙二醇酯pET之溶液相可僅藉著冷卻 該溶液且使該聚對苯二甲酸乙二醇酯PET沉澱，而簡便地自 未溶解之塑料分離。沉澱之聚對苯二甲酸乙二醇酯PET隨之 藉技藝界一般已知之方法再循環，包括例如但不限於過濾 、傾析、蒸發及其類者。與聚苯乙烯相同地，所回收之軟 化聚對笨二曱酸乙二醇酯PET亦可進行再處理，藉後續方法 如注模、擠塑、及/或吹塑及其類者而移除及回收殘留溶劑 。自該後續處理取出之揮發溶劑較佳可再循環至該溶劑/聚 苯乙烯或聚對笨二甲酸乙二醇酯PET接觸步驟（即溶解聚合 物）。 圖1係說明基本觀念，包括使用本發明液相溶劑系統自混 合塑料流分離及回收聚苯乙烯及聚對苯二甲酸乙二醇酯PET 之更經濟方法。在混合塑料廢流―由例如發泡聚苯乙烯及聚 本纸張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐) 558562 A7A product of Wilmington's Du Pont de Nemours and Company, Inc., named DBE. The solvent system of the present invention is considered to be particularly useful for separating, recovering, and reusing polystyrene from polyethylene terephthalate PET in the presence of polyolefins. The dissolution of such polystyrene is generally from 0. 〇 to below 160. A temperature range of 0 is achieved at substantially atmospheric pressure (only higher pressures may be used, but not necessary). 5xuan > Cereals can also be considered to collapse and subsequently dissolve any low-density polystyrene foam, especially including open and closed honeycomb foams and so-called bead-type polystyrene foams. Thing. The method of selectively dissolving polystyrene and baking is usually carried out in a composition range as low as 1% by weight polystyrene and 99% by weight solvent system to 40% by weight polystyrene and 60% by weight solvent. The solution phase containing dissolved polystyrene can be easily separated from undissolved plastics by methods generally known in the art, including, for example, but not limited to, filtration, decantation, evaporation, and the like. The recovered softened polystyrene can also be reprocessed. By this follow-up method such as injection and / or paper size, the national standard (CNS) A4 specification (21〇297297) is used. -B7 V. Description of the invention (5) or recovery of residual solvents during extrusion molding. The volatile solvent withdrawn from the subsequent treatment may preferably be recycled to the solvent / polystyrene contacting step (i.e., dissolving polyethylene) or the like. The solvent system of the present invention is also considered to be particularly useful for the separation, recovery and re-shielding of polyethylene terephthalate PEE from the polyolefin. However, the dissolution of such polyethylene terephthalate PET is generally achieved in the high temperature range from 160 to 225, and basically atmospheric pressure is still used (only higher pressures can be used, but not necessary). The method of selectively dissolving polyethylene terephthalate PET at high temperature is usually as low as 1% by weight polyethylene terephthalate PET and 99% by weight solvent system to 40% by weight polymer. It is carried out under the composition range of polyethylene terephthalate PET and 60 weight percent solvent. The solution phase containing dissolved polyethylene terephthalate pET can be easily separated from the undissolved plastic simply by cooling the solution and precipitating the polyethylene terephthalate PET. The precipitated polyethylene terephthalate PET is then recycled by methods generally known in the art, including, but not limited to, filtration, decantation, evaporation, and the like. As with polystyrene, the recovered softened polyethylene terephthalate PET can also be reprocessed and removed by subsequent methods such as injection molding, extrusion, and / or blow molding and the like And recover residual solvents. The volatile solvent withdrawn from the subsequent treatment may preferably be recycled to the solvent / polystyrene or polyethylene terephthalate PET contact step (i.e., dissolving the polymer). Figure 1 illustrates basic concepts, including a more economical method for separating and recovering polystyrene and polyethylene terephthalate PET from a mixed plastic stream using a liquid solvent system of the present invention. In mixed plastic waste streams-from, for example, expanded polystyrene and poly paper, this paper applies Chinese National Standard (CNS) A4 (210 X 297 mm) 558562 A7
對苯二甲酸乙二醇酯PET、低密度聚乙烯（LDpE)、高密度 聚乙烯（HDPE)、及聚丙烯（PP)所組成—中，聚苯乙烯可於室 溫及壓力下浸潰或接觸該液體溶劑/輔溶劑系統，而與其他 塑料分離。 如前文所說明，該發泡聚苯乙烯與該液體溶劑相接觸時 ’塌癟且溶解於該液體溶劑系統中。應已知自混合塑料廢 流塌癟及溶解發泡聚苯乙烯之過程可藉著在與液相接觸之 前’視情況進行研磨或切片步驟而促進。而且，任何非發 泡聚苯乙烯皆傾向與經塌癟之聚苯乙烯一起溶解及移除。 此聚苯乙烯溶液隨之可視情況進行蒸發/蒸餾步驟及/或簡便 地送至擠塑機，以於製造聚苯乙烯或其類產物之同時回收 及再利用所夾帶之溶劑。 如圖1所說明，在移除聚苯乙烯/DBE溶液之後所殘留之 未溶解固體，即PET、LDPE、HDPE、及PP ,在附加之DBE 溶劑存在下加熱至介於160至225 °C範圍内之溫度。殘留於 該混合塑料中之PET於此等溫度下在大氣壓下溶解於該液體 溶劑相中。本發明之優點係該二甲酯溶劑系統一般具有高 於2 0 0 C之）弗點’因此不需施壓（額外能量輸入）於該系統上 ’以使溶劑保持液態。亦使分離流程變得較不複雜，因為 分離始終包括一液流。因為部分聚合物之降解係於約25〇°c 下開始發生，’故本發明溶劑系統係理想溶劑。該PET/DBE 溶液之實際單離及回收可藉熱過濾（或其他技藝界已知之類 似分離方法）達成，因此，自未溶解之其他塑料分離已溶解 之聚對苯二甲酸乙二醇酯PET。此步驟之後係將溶解之聚對 -9- 本紙張尺度適财S 8家標準(CNS) A4規格(210 X 297公《) " 558562 五、發明説明（7 ) 苯二甲酸乙二醇酯PET溶液冷卻至16(rc，以使該聚對苯二 甲酸乙二醇酯PET沉澱析出。較佳係自混合塑料流分離由^ 重量百分比至4G重量百分比之聚笨乙烯及/或聚對苯二甲酸 乙二醇酯PET。 以下實施例係用以更充分地說明且進一步說明本發明 之各種個別態樣及特徵，用以進一步闡釋本發明之差異 及優點。非限制性實施例係用以說明本發明，而非不當 之限制。 實施例1 藉著添加發泡聚本乙稀於該有機溶劑中，製備並觀察一 系列包括20重量百分比發泡聚苯乙烯且與8〇重量百分比液 相有機溶劑於室溫及壓力下接觸之個別混合物的行為。所 使用之D B E;谷劑係為丁二酸、戊二酸、及己二酸之二甲酯 的摻合物（即20重量百分比丁二酸酯，60重量百分比戊二酸 酯，及20重量百分比二醢酷）。^呈釗丨v nr处里· 溶劑 結果 DBE 溶解聚苯乙烯 第三丁醇 不溶解或塌癟聚苯乙烯 雙丙酮醇（DAA) r 不溶解或塌癟聚苯乙烯 乙二醇（EG) 不溶解或塌癟聚苯乙烯 碳酸丙二醇酯 不溶解或塌癟聚苯乙烯 異丙醇（IPA) 不溶解或塌癟聚苯乙烯 一 f基亞石風 不溶解或塌癟聚苯乙烯 丙_ 溶解聚苯乙烯 10- 本纸張尺度適用中國國家標準(CNS) A4規格(21〇x 297公釐） 558562 A7 B7 五、發明説明（8 ) N-甲基吡咯啉酮（NMP) 溶解聚苯乙烯 二丙二醇甲基醚 溶解聚苯乙烯 甲苯 溶解聚苯乙烯 實施例2 20重量百分比聚對苯二甲酸乙二醇酯PET添加於含有丁 二酸、戊二酸、及己二酸之二甲酯之溶液中，形成之混合 物進行加熱。在180°C下，該聚對苯二甲酸乙二醇酯PET開 始”軟化’’，且於200°C下，該聚對苯二甲酸乙二醇酯PET溶 解。該溶液冷卻至160至170 °C之範圍時，聚對苯二甲酸乙 二醇酯PET再自該DBE溶液沉澱析出。 沉殿之PET藉差示掃描熱量法進行熱分析顯示所回收之 PET的熱性質同等於原始者。兩PET試樣皆於245 °C顯示吸 熱特徵，而於453°C下顯示放熱特徵。 對照例3 在最高達225°C試驗之以下其他溶劑中，聚對苯二曱酸乙 二醇酯PET不溶解（溶劑系統係保持於用以保持液態所需之 壓力下）： 庚烷、二乙二醇丁基醚、乙二醇、二異丁基酮、甲苯、 丙二醇、丙二醇甲基醚、及雙丙酮醇。 、實施例4 :混合塑料 4克發泡聚苯乙烯、4克聚對笨二甲酸乙二醇酯PET、4克 高密度聚乙烯（HDPE)、4克低密度聚乙烯（LDPE)、及4克聚 丙烯之混合塑料流係添加於100克由丁二酸、戊二酸、及己 二酸之二甲酯所組成之溶劑中。該聚苯乙烯於室溫下溶解 -11 - 本紙張尺度適用中國國家標準(CNS) A4規格(210X 297公釐） 558562 A7 B7 五、發明説明（9 ) ，藉濾出所溶解之聚苯乙烯，而自其他塑料分離該聚苯乙 烯。該聚苯乙烯係藉著蒸發溶劑且使聚苯乙烯沉澱而自溶 液回收。未溶解之其他塑料置入1 〇〇克DBE溶劑中。加熱至 205°C時，聚對苯二甲酸乙二醇酯PET溶解。之後趁熱過濾 該混合物，以分離諒含有溶解聚對苯二甲酸乙二醇酯PET之 熱溶液及其他未溶解之塑料。該聚對苯二甲酸乙二醇酯PET 溶液冷卻至160 °C，以使PET沉澱。過濾回收該PET/自混 合塑料回收之聚苯乙烯之比率係為100百分比，而PET之回 收率係為98百分比。 實施例5:混合塑料 0.5克聚苯乙烯、0.5克聚對苯二甲酸乙二醇酯PET、6.3克 高密度聚乙烯（HDPE)、6.3克低密度聚乙烯（LDPE)、及6.3 克聚丙烯之混合塑舒流係添加於100克由丁二酸、戊二酸、 及己二酸之二甲酯所組成之溶劑中。該聚苯乙烯於室溫下 溶解，藉濾出所溶解之聚苯乙烯，而自其他塑料分離該聚 苯乙烯。該聚苯乙烯係藉著蒸發溶劑且使聚苯乙稀沉澱而 自溶液回收。未溶解之其他塑料置入100克DBE溶劑中。加 熱至205°C時，聚對苯二甲酸乙二醇酯PET溶解。之後趁熱 過濾該混合物，以分離該含有溶解聚對苯二甲酸乙二醇酯 PET之熱溶液及其他未溶解之塑料。該聚對苯二甲酸乙二醇 酯PET溶液冷卻至160°C，以使PET沉澱。過濾回收該PET。 自混合塑料回收之聚苯乙烯之比率係為60百分比，而PET之 回收率係為100百分比。 實施例6:混合塑料 -12- 本紙張尺度適用中國國家標準(CNS) A4規格(210X 297公釐）It is composed of polyethylene terephthalate PET, low density polyethylene (LDpE), high density polyethylene (HDPE), and polypropylene (PP). Among them, polystyrene can be impregnated at room temperature and pressure or Contact this liquid solvent / co-solvent system and separate from other plastics. As explained above, the expanded polystyrene collapses when in contact with the liquid solvent and dissolves in the liquid solvent system. It is known that the process of collapse from mixed plastic waste and dissolving expanded polystyrene can be facilitated by 'grinding or slicing steps, as appropriate, prior to contact with the liquid phase. Moreover, any non-foamed polystyrene tends to dissolve and remove with collapsed polystyrene. This polystyrene solution may then be subjected to an evaporation / distillation step and / or simply sent to an extruder, as appropriate, to recover and reuse the entrained solvent while manufacturing polystyrene or similar products. As illustrated in Figure 1, the undissolved solids remaining after removal of the polystyrene / DBE solution, namely PET, LDPE, HDPE, and PP, are heated to the range of 160 to 225 ° C in the presence of additional DBE solvents Within the temperature. The PET remaining in the mixed plastic was dissolved in the liquid solvent phase at these temperatures at atmospheric pressure. The advantage of the present invention is that the dimethyl solvent system generally has a puff point ' which is higher than 200 ° C, so no pressure (extra energy input) is required on the system ' to keep the solvent liquid. It also makes the separation process less complicated, because separation always involves a liquid stream. Since degradation of some polymers begins to occur at about 25 ° C, the solvent system of the present invention is an ideal solvent. The actual isolation and recovery of the PET / DBE solution can be achieved by thermal filtration (or other similar separation methods known in the art). Therefore, the dissolved polyethylene terephthalate PET is separated from other undissolved plastics. . After this step is to dissolve the dissolved poly--9- this paper size suitable for S 8 standards (CNS) A4 specifications (210 X 297 public "" & 558562 5. Description of the invention (7) ethylene phthalate The PET solution is cooled to 16 (rc) to precipitate the polyethylene terephthalate PET. Preferably, the polystyrene and / or poly-p-phenylene are separated from the mixed plastic stream from ^ wt% to 4Gwt%. Diethylene glycol diformate PET. The following examples are used to more fully illustrate and further explain various individual aspects and features of the present invention to further explain the differences and advantages of the present invention. Non-limiting examples are used to Illustrate the present invention, rather than improper limitation. Example 1 By adding foamed polyethylene in the organic solvent, a series of 20% by weight expanded polystyrene and 80% by weight liquid phase were prepared and observed. Behavior of individual mixtures in contact with organic solvents at room temperature and pressure. The DBE used; cereals are blends of succinic acid, glutaric acid, and dimethyl adipate (ie, 20% by weight butyl Diester, 60% by weight Acid ester, and 20% by weight of dioxin). ^ Chengzhao v nr at the solvent result DBE dissolved polystyrene tertiary butanol insoluble or collapsed polystyrene diacetone alcohol (DAA) r insoluble or Collapse polystyrene ethylene glycol (EG) Insoluble or collapsed polystyrene propylene carbonate Insoluble or collapsed polystyrene isopropyl alcohol (IPA) Insoluble or collapsed polystyrene-f-based Undissolved or collapsed polystyrene acrylic _ Dissolved polystyrene 10- This paper size applies to Chinese National Standard (CNS) A4 (21 × 297 mm) 558562 A7 B7 V. Description of the invention (8) N-A Pyrrolidone (NMP) Dissolved Polystyrene Dipropylene glycol methyl ether Dissolved Polystyrene Toluene Dissolved Polystyrene Example 2 20% by weight of polyethylene terephthalate PET Added to succinic acid and glutaric acid In a solution of acid and dimethyl adipate, the resulting mixture is heated. At 180 ° C, the polyethylene terephthalate PET begins to "soften", and at 200 ° C, The polyethylene terephthalate PET is dissolved. The solution is cooled to 160 to 17 At a temperature of 0 ° C, polyethylene terephthalate PET was precipitated from the DBE solution. Shen Dianzhi's PET thermal analysis by differential scanning calorimetry showed that the thermal properties of the recovered PET were equivalent to the original Both PET samples showed endothermic characteristics at 245 ° C and exothermic characteristics at 453 ° C. Comparative Example 3 Polyethylene terephthalate was tested in other solvents up to 225 ° C. PET is insoluble (solvent system is maintained at the pressure required to maintain liquidity): heptane, diethylene glycol butyl ether, ethylene glycol, diisobutyl ketone, toluene, propylene glycol, propylene glycol methyl ether, And diacetone alcohol. Example 4: 4 g of expanded polystyrene, 4 g of polyethylene terephthalate PET, 4 g of high-density polyethylene (HDPE), 4 g of low-density polyethylene (LDPE), and 4 A gram of polypropylene mixed plastic stream is added to 100 grams of a solvent consisting of succinic acid, glutaric acid, and dimethyl adipate. This polystyrene dissolves at room temperature-11-This paper size applies Chinese National Standard (CNS) A4 specification (210X 297 mm) 558562 A7 B7 V. Description of the invention (9) By filtering out the dissolved polystyrene, The polystyrene is separated from other plastics. This polystyrene is recovered from the solution by evaporating the solvent and precipitating the polystyrene. The other undissolved plastic was placed in 1000 g of DBE solvent. When heated to 205 ° C, polyethylene terephthalate PET dissolves. The mixture was then filtered while hot to separate the hot solution containing dissolved polyethylene terephthalate PET and other undissolved plastics. The polyethylene terephthalate PET solution was cooled to 160 ° C to precipitate the PET. The ratio of the PET / PS polystyrene recovered by filtration was 100%, and the PET recovery was 98%. Example 5: 0.5 g of polystyrene, 0.5 g of polyethylene terephthalate PET, 6.3 g of high density polyethylene (HDPE), 6.3 g of low density polyethylene (LDPE), and 6.3 g of polypropylene The mixed plastic flow is added to 100 g of a solvent consisting of succinic acid, glutaric acid, and dimethyl adipate. The polystyrene was dissolved at room temperature, and the polystyrene was separated from other plastics by filtering out the dissolved polystyrene. This polystyrene is recovered from the solution by evaporating the solvent and precipitating polystyrene. Undissolved other plastic was placed in 100 grams of DBE solvent. Upon heating to 205 ° C, polyethylene terephthalate PET dissolves. The mixture was then filtered while hot to separate the hot solution containing dissolved polyethylene terephthalate PET and other undissolved plastics. The polyethylene terephthalate PET solution was cooled to 160 ° C to precipitate the PET. The PET was recovered by filtration. The ratio of polystyrene recovered from the mixed plastic is 60% and the recovery of PET is 100%. Example 6: Mixed plastic -12- This paper size applies to China National Standard (CNS) A4 specification (210X 297 mm)
裝 訂 f 558562 A7 B7 五 、發明説明（1〇 ) 9.25克聚苯乙烯、9.25克聚對苯二甲酸乙二醇酯PET、0.5 克高密度聚乙烯（HDPE)、0.5克低密度聚乙烯（LDPE)、及 0.5克聚丙烯之混合塑料流係添加於100克由丁二酸、戊二 酸、及己二酸之二甲酯所組成之溶劑中。該聚苯乙烯於室 溫下溶解，藉濾出所溶解之聚苯乙烯，而自其他塑料分離 該聚苯乙烯。該聚苯乙烯係藉著蒸發溶劑且使聚苯乙烯沉 澱而自溶液回收。桌溶解之其他塑料置入100克DBE溶劑中 。加熱至205 °C時，聚對苯二甲酸乙二醇酯PET溶解。之後 趁熱過濾該混合物，以分離該含有溶解聚對苯二曱酸乙二 醇酯PET之熱溶液及其他未溶解之塑料。該聚對苯二f酸乙 二醇酯PET溶液冷卻至160 °C，以使PET沉澱。過濾回收該 PET。自混合塑料回收之聚苯乙烯之比率係為99百分比，而 PET之回收率係為82百分比。 使用特定情況描述及例示本發明之後，應已知以下申請 專利範圍並非限制1而是提供符合申請專利標的及其同等 物之各元素的範圍。 -13- 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐)Binding f 558562 A7 B7 V. Description of the invention (10) 9.25 g polystyrene, 9.25 g polyethylene terephthalate PET, 0.5 g high density polyethylene (HDPE), 0.5 g low density polyethylene (LDPE ), And 0.5 g of polypropylene mixed plastic stream is added to 100 g of a solvent composed of succinic acid, glutaric acid, and dimethyl adipate. The polystyrene was dissolved at room temperature, and the polystyrene was separated from other plastics by filtering out the dissolved polystyrene. The polystyrene is recovered from the solution by evaporating the solvent and precipitating the polystyrene. Dissolve the other plastic in the table in 100 grams of DBE solvent. When heated to 205 ° C, polyethylene terephthalate PET dissolves. The mixture was then filtered while hot to separate the hot solution containing the dissolved polyethylene terephthalate PET and other undissolved plastics. The polyethylene terephthalate PET solution was cooled to 160 ° C to precipitate the PET. The PET was recovered by filtration. The ratio of polystyrene recovered from the mixed plastic is 99%, and the recovery of PET is 82%. After describing and exemplifying the present invention using specific circumstances, it should be known that the scope of the following patent applications is not limited to 1 but provides a range of elements that meet the subject matter of the patent application and their equivalents. -13- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)
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