JP6433867B2 - 水素ガス回収システムおよび水素ガスの分離回収方法 - Google Patents
水素ガス回収システムおよび水素ガスの分離回収方法 Download PDFInfo
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Description
HSiCl3 + H2 → Si + 3HCl ・・・(式1)
HSiCl3 + HCl → SiCl4 + H2 ・・・(式2)
C + 2H2 → CH4 ・・・(式3)
多結晶シリコン製造装置の反応排ガスからクロロシラン類、モノシラン、及び塩化水素を分離し、メタンを0.5ppm含む回収水素を合成ゼオライト充填層に導入し、メタンの吸着除去と脱着を行った。
実施例1と同じ条件で、吸着剤を活性炭(特許文献1に記載されている平均細孔半径12Å以下の、詳細には平均細孔径8Å、比表面積550〜600m2/g、ヤシ殻、ペレット成形)として、メタンの吸着除去と脱着を行った。
B 圧縮装置
C 吸収装置
D 第1の吸着装置
E 第2の吸着装置
F、G1、G2 ガスライン
Claims (8)
- トリクロロシランを原料として多結晶シリコンを製造する装置からの反応排ガスから水素ガスを分離回収するための水素ガス回収システムであって、
A:多結晶シリコン製造工程からの、水素を含む反応排ガスからクロロシラン類を凝縮分離する凝縮分離装置と、
B:前記凝縮分離装置を経た、水素を含む反応排ガスを圧縮する圧縮装置と、
C:前記圧縮装置を経た、水素を含む反応排ガスを吸収液と接触させて塩化水素を吸収分離する吸収装置と、
D:前記吸収装置を経た、水素を含む反応排ガスに含まれる、メタン、塩化水素、およびクロロシラン類の一部を吸着除去するための活性炭を充填した吸着塔からなる第1の吸着装置と、
E:前記第1の吸着装置を経た、水素を含む反応排ガスに含まれるメタンを吸着除去する合成ゼオライトを充填した吸着塔からなる第2の吸着装置と、
F:前記第2の吸着装置から排出されたメタン濃度を低減させた精製水素ガスを回収するガスライン、
を備え、
前記第2の吸着装置に充填される合成ゼオライトは、主成分であるシリカ(SiO2)とアルミナ(Al2O3)の分子比(SiO2/Al2O3)が2以上で30以下であり、
前記第2の吸着装置によるメタンの吸着を、温度範囲−30℃〜+100℃で且つ圧力範囲0.4MPa〜2MPaの下で行い、
前記合成ゼオライトは、陽イオンとして、バリウムの陽イオンを含む、
ことを特徴とする水素ガス回収システム。 - 前記第1の吸着装置は、前記活性炭を充填した吸着塔を複数備えている、請求項1に記載の水素ガス回収システム。
- 前記第2の吸着装置は、前記合成ゼオライトを充填した吸着塔を複数備えている、請求項1に記載の水素ガス回収システム。
- 前記第2の吸着装置で精製した水素ガスを、前記第1の吸着装置および前記第2の吸着装置の少なくとも一方が備える吸着塔の再生時のキャリアガスとして利用するガスラインを備えている、請求項1に記載の水素ガス回収システム。
- 前記第2の吸着装置で精製した水素ガスを、前記第2の吸着装置が備える吸着塔の再生時のキャリアガスとして利用し、該吸着塔の再生時排ガスを、前記第1の吸着装置が備える吸着塔の再生時のキャリアガスとして利用するガスラインを備えている、請求項1に記載の水素ガス回収システム。
- トリクロロシランを原料として多結晶シリコンを製造する装置からの反応排ガスから水素ガスを分離回収する方法であって、
請求項1〜5の何れか1項に記載の水素ガス回収システムを用い、
前記第2の吸着装置により、前記水素ガス中のメタン濃度を1ppm以下に精製して回収する、水素ガスの分離回収方法。 - 前記第1の吸着装置により、前記水素ガス中の塩化水素濃度を100ppmv以下、且つ、クロロシラン類濃度を100ppmv以下に精製する、請求項6に記載の水素ガスの分離回収方法。
- 前記第2の吸着装置が備える吸着塔の再生時の塔内圧力を0.3MPaA以下で行う、請求項6に記載の水素ガスの分離回収方法。
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| CN112707373B (zh) * | 2020-12-16 | 2022-06-10 | 浙江天采云集科技股份有限公司 | 一种含HF/HCl蚀刻尾气FTrPSA分离与回收循环再利用方法 |
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